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EM78P312N

8-Bit Microcontroller

28

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Product Specification (V1.0) 10.03.2006

(This specification is subject to change without further notice)

5.7 UART (Universal Asynchronous Receiver/Transmitter)

Registers for UART Circuit

R_BANK Address Name Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

URTD8 UMODE1 UMODE0 BRATE2 BRATE1 BRATE0 UTBE

TXE

Bank 2

0X05

URC1

R/W R/W R/W R/W R/W R/W R R/W

0 0

SBIM1 SBIM0

UINVEN

0 0 0

Bank 2

0X06

URC2

-- --

R/W R/W R/W

-- -- --

URRD8

EVEN PRE

PRERR OVERR FMERR

URBF RXE

Bank 2

0X07

URS

R/W R/W R/W R/W R/W R/W R R/W

URRD7 URRD6 URRD5 URRD4

URRD3

URRD2 URRD1 URRD0

Bank 2

0X08

URRD

R R R R R R R R

URTD 7 URTD 6

URTD 5

URTD 4 URTD 3 URTD 2 URTD 1 URTD0

Bank 2

0X09

URTD

W W W W W W W W

0

UERRIF

RBFF TBEF

TBIF

EXIF1 0 TCIF0

Bank 0

0x0F

ISFR2

--

R/W R/W R/W

R/W

R/W -- R/W

0

UERRIE

URIE UTIE

TBIE EXIE1 0 TCIE0

SFR 0x0F

IMR2

--

R/W R/W R/W

R/W

R/W -- R/W

Baud rate

generator

Sele

cto
r

TC4

RX Control

TX Control

Interrupt

Control

RX shift register

URRD

URTD

URRD8

RX

TX

Parity control

Error flag

Data Bus

URTD8

RXE

TXE

UINVEN

UINVEN

Fsystem

Fig. 5-10 Function Block Diagram

In Universal Asynchronous Receiver Transmitter (UART), each transmitted or received
character is individually synchronized by framing it with a start bit and stop bit.

Full duplex data transfer is possible since the UART has independent transmit and
receive sections. Double buffering for both sections allows the UART to be
programmed for continuous data transfer.

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Содержание EM78P312N

Страница 1: ...EM78P312N 8 BIT Microcontroller Green Product Specification DOC VERSION 1 0 ELAN MICROELECTRONICS CORP October 2006...

Страница 2: ...ed or copied only in accordance with the terms of such agreement ELAN Microelectronics products are not intended for use in life support appliances devices or systems Use of ELAN Microelectronics prod...

Страница 3: ...ous Receiver Transmitter 28 5 7 1 UART Mode 29 5 7 2 Transmitting 29 5 7 3 Receiving 30 5 7 4 Baud Rate Generator 30 5 8 SPI Serial Peripheral Interface 31 5 8 1 Serial Clock 32 5 8 2 Shift Direction...

Страница 4: ...ode Option Register 53 5 17 1 Code Option Register Word 0 53 5 17 2 Customer ID Register 54 5 18 Power on Considerations 54 5 18 1 External Power on Reset Circuit 54 5 18 2 Residue Voltage Protection...

Страница 5: ...s inst cycle 3V Peripheral configuration zSerial peripheral interface SPI available zUniversal asynchronous receiver transmitter interface UART available z16 bits Counter Timer TC2 Timer Counter Windo...

Страница 6: ...ins P70 can be used as SPI serial clock input output SCK P71 can be used as SPI serial data input SI or UART data receive input RX P72 can be used as SPI serial data output SO or UART data transmit ou...

Страница 7: ...uction Register ALU PC Interrupt Circuit 8 levelstack 13 bit Interrupt Control Register Oscillation Generation RAM Mux Ext OSC R4 Ext RC Start up Timer WDT TC2 TC3 TC4 UART SPI TCC TBKTC ADC Ain 0 7 S...

Страница 8: ...C4D ISFR0 ISFR1 ISFR2 TC3CR TC3DA TC3DB TC2CR ADDL TC2DH TC2DL ADCR ADIC ADDH TBKTC Reserved URC1 URC2 URS URRD URTD Reserved Reserved Reserved Reserved Reserved Reserved SPIC1 SPIC2 SPID Reserved Res...

Страница 9: ...hip OTP ROM addresses to the relative programming instruction codes One program page is 1024 words long z R2 is set as all 0 s when under RESET condition z JMP instruction allows direct loading of the...

Страница 10: ...curs TCC Overflow External INT1 pin Interrupt Occurs Time Base Timer Interrupt UART Transmit Data Buffer Empty UART Receive Data Buffer Full UART Receive Error TC3 Interrupt SPI Interrupt TC4 Interrup...

Страница 11: ...as an 8 bit general purpose read write register See the data memory configuration in Fig 5 2 R5 System Control Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 0 0 PS1 PS0 0 1 SIS REM Bits 5...

Страница 12: ...I O Data Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 0 0 0 0 0 0 P81 P80 Bit 1 Bit 0 P81 P80 Port 81 Port 80 I O data register User can use IOC8 register to define each bit whether input...

Страница 13: ...grammable Divider output 1 1 Pulse Width Modulation output RC Timer 4 Data Buffer Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 TC4D7 TC4D6 TC4D5 TC4D4 TC4D3 TC4D2 TC4D1 TC4D0 Bit 7 Bit 0 TC4D7 TC4D...

Страница 14: ...eared by software 0 means no interrupt request 1 means with interrupt request z ISFR1 can be cleared by instruction but cannot be set by instruction z IMR1 is the interrupt mask register z Note that r...

Страница 15: ...1 Start Bit 5 Bit 4 TC3CK1 TC3CK0 Timer Counter 3 Clock Source Select TC3CK1 TC3CK0 Clock source Normal Idle Resolution Fc 8M Max time Fc 8M 0 0 Fc 2 12 512 S 131 1mS 0 1 Fc 2 10 128 S 32 6mS 1 0 Fc 2...

Страница 16: ...0 Fc 2 23 1 05s 19 1h 0 0 1 Fc 2 13 1 02ms 1 1min 0 1 0 Fc 2 8 32 s 2 1s 0 1 1 Fc 2 3 1 s 65 5ms 1 0 0 Fc 125ns 7 9ms 1 0 1 1 1 0 1 1 1 External clock TC2 pin Bank 1 R9 TC2DH Timer 2 Data Buffer High...

Страница 17: ...d Bit 3 ADP AD power control ADP 0 Power on ADP 1 Power down Bit 2 Bit 0 ADIS2 ADIS0 Analog Input Pin Select ADIS2 ADIS1 ADIS0 Analog Input Pin 0 0 0 AD0 0 0 1 AD1 0 1 0 AD2 0 1 1 AD3 1 0 0 AD4 1 0 1...

Страница 18: ...7 812kHz Bit 3 TBTEN Time Base Timer Enable Control TBTEN 0 Disable TBTEN 1 Enable Bit 2 Bit 0 TBTCK2 TBTCK0 Time Base Timer Clock Source Select TBTCK2 TBTCK1 TBTCK0 Clock Source Normal Idle Interrupt...

Страница 19: ...e transmission UTBE bit is read only Therefore writing to the URTD register is necessary when starting transmission shifting Bit 0 TXE Enable transmission TXE 0 Disable TXE 1 Enable Bank 2 R6 URC2 UAR...

Страница 20: ...r URBF will be cleared by hardware when receiving is enabled URBF bit is read only Therefore reading the URS register is necessary to avoid an overrun error Bit 0 RXE Enable receiving RXE 0 Disable RX...

Страница 21: ...122Kbit s 1 0 1 Fc 2 5 244Kbit s 1 1 0 External clock SCK pin Enable ss pin 1 1 1 External clock SCK pin Disable ss pin Bit 2 EDS Data shift out edge select EDS 0 Rising edge EDS 1 Falling edge Bit 1...

Страница 22: ...4 Bit 3 Bit 2 Bit 1 Bit 0 SPID7 SPID6 SPID5 SPID4 SPID3 SPID2 SPID1 SPID0 Bit 7 Bit 0 SPID7 SPID0 SPI data buffer Bank 3 RA PHC1 Pull High Control Register 1 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1...

Страница 23: ...low R10 R1F and R20 R3F including Banks 0 3 are General Purpose Register 5 3 Special Purpose Registers A Accumulator Internal data transfer operation or instruction operand holding usually involves t...

Страница 24: ...ritable INTCR INT Control Register Address 0Bh Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 INT1NR INT0EN 0 INT3ES1 INT3ES0 0 INT1ES TC2ES Bit 7 INT1NR INT1 noise reject time select INT1NR 0 Pulses...

Страница 25: ...Calibration Bit 6 SIGN Offset voltage Polarity bit SIGN 0 Negative voltage SIGN 1 Positive voltage Bit 5 Bit 3 VOF 2 VOF 0 Offset voltage bits IMR1 Interrupt Mask Register 1 Address 0Eh Bit 7 Bit 6 B...

Страница 26: ...0 TCIE0 Bit 6 UERRIE UART receive error interrupt enable bit UERRIE 0 disable UERRIF interrupt UERRIE 1 enable UERRIF interrupt Bit 5 URIE UART receive mode interrupt enable bit URIE 0 disable RBFF in...

Страница 27: ...ormal SLEEP pin wake up Normal Idle Set SIS 0 execute SLEP instruction Idle Normal Interrupt Table 3 Operation Mode Operation Mode Frequency CPU Code On chip Peripherals Reset Reset Reset Normal Fosc...

Страница 28: ...No effect 1 Individual interrupt source in IMR1 IMR2 2 WDT interrupt request 3 INT0 4 Execute ENI instruction No effect 1 Wake up 2 Jump to an Interrupt vector after RETI instruction then jump to the...

Страница 29: ...e ADC The source impedance and the internal sampling impedance directly affect the time required to charge the sample holding capacitor The application program controls the length of the sample time t...

Страница 30: ...R W R W 0 UERRIF RBFF TBEF TBIF EXIF1 0 TCIF0 Bank 0 0x0F ISFR2 0 R W R W R W R W R W 0 R W 0 UERRIE URIE UTIE TBIE EXIE1 0 TCIE0 SPR 0x0F IMR2 0 R W R W R W R W R W 0 R W MUX Fosc 2 Fosc 2 Fosc 2 Fo...

Страница 31: ...sc 2 Fosc 2 23 21 16 14 13 12 11 9 TBKTC TBTCK2 0 3 Falling Edge Detector TBT Interrupt TBTEN Fig 5 8 TBT Configuration The Time Base Timer is used to generate the base time for key scan or dynamic di...

Страница 32: ...URTD 6 URTD 5 URTD 4 URTD 3 URTD 2 URTD 1 URTD0 Bank 2 0X09 URTD W W W W W W W W 0 UERRIF RBFF TBEF TBIF EXIF1 0 TCIF0 Bank 0 0x0F ISFR2 R W R W R W R W R W R W 0 UERRIE URIE UTIE TBIE EXIE1 0 TCIE0...

Страница 33: ...e samples it is recognized as normal start bit and the receiving operation is started START bit D0 D1 D2 Dn Parity bit STOP bit 1 bit 7 or 8 bits One character or frame 1 bit 1 bits Idle state mark I...

Страница 34: ...p bit are received After one character received the UART generates a RBFF interrupt if enable And URBF bit of URS register will be set to 1 4 The UART makes the following checks a Parity check The num...

Страница 35: ...5 TCIF2 ADIF 0 EXIF3 TCIF4 SPIF TCIF3 Bank 0 0x0E ISFR1 R W R W R W R W R W R W R W EXIE5 TCIE2 ADIE 0 EXIE3 TCIE4 SPIE TCIE3 SFR 0x0E IMR1 R W R W R W R W R W R W R W SHIFT Register SPID reg Prescale...

Страница 36: ...r at the end of the data output time 5 8 3 Transfer Mode The transmit receive transmit receive mode can be selected by setting SPIM0 SPIM1 a 8 bit Transmit Mode Set SPIM0 SPIM12 to transmit mode and w...

Страница 37: ...in a0 a1 a2 a3 a4 a5 a6 a7 a SPID b0 b1 b2 b3 b4 b5 b6 b7 read data b shift finish Fig 5 15 Receive Mode 8 bit 1 word c 8 bit Transmit Receive Mode Set SPIM0 SPIM1 to transmit receive mode and write d...

Страница 38: ...eive Mode 8 bit 1 word d Multiple Device Connect SS When selecting external clock for transfer clock source the SS function can be used This pin SS will be active when the SS function is enabled else...

Страница 39: ...TC2D8 Bank 1 0X09 TC2DH R W R W R W R W R W R W R W R W TC2D7 TC2D6 TC2D5 TC2D4 TC2D3 TC2D2 TC2D1 TC2D0 Bank 1 0X0A TC2DL R W R W R W R W R W R W R W R W EXIF5 TCIF2 ADIF 0 EXIF3 TCIF4 SPIF TCIF3 Ban...

Страница 40: ...TC2 pin and either rising or falling can be selected by setting TC2ES When the contents of the up counter matched with the TCR2 TCR2H TCR2L then interrupt is generated and the counter is cleared Coun...

Страница 41: ...t 4 Bit 3 Bit 2 Bit 1 Bit 0 TC3CAP TC3S TC3CK1 TC3CK0 TC3M 0 0 0 Bank 1 0X05 TC3CR R W R W R W R W R W TC3DA7 TC3DA6 TC3DA5 TC3DA4 TC3DA3 TC3DA2 TC3DA1 TC3DA0 Bank 1 0X06 TC3DA R W R W R W R W R W R W...

Страница 42: ...e In Counter mode counting up is performed using the external clock input pin TC3 pin and either rising or falling edge can be selected by INT3ES0 but both edge cannot be used When the contents of the...

Страница 43: ...capture and overflow detection are halted until TCR3DA is read out K 2 K 1 K 0 1 m 1 m m 1 n 1 n 0 1 2 3 FE FF0 1 2 3 Source Clock Up counter TC3 Pin Input TCR3DA TCR3DB TC3 Interrupt Reading TCR3DA K...

Страница 44: ...med on the rising edge of the external clock input pin TC4 pin When the contents of the up counter matched with the TCR4 then interrupt is generated and the counter is cleared Counting up resumes afte...

Страница 45: ...R4 TC4 Interrupt n n n 2 F F PWM Match Overflow n 1 n Match n 2 Overflow 1 Period n m m m Overwrite Shift m 1 1 m Fig 5 26 Timing Chart for PWM Mode 5 12 TCC WDT Prescaler An 8 bit counter is availabl...

Страница 46: ...M U X IOD PCRD Fig 5 27 The I O Port and I O Control Register Circuit 5 14 Reset and Wake up 5 14 1 Reset A reset is initiated by one of the following events 1 Power on reset 2 RESET pin input low 3 W...

Страница 47: ...in The controller will be waken up and execute the next instruction after entering Sleep mode All the registers will maintain their original values before SLEP instruction was executed 2 RESET pin pul...

Страница 48: ...DT time out 0 P P P P U U U 0x0C ADOSC R Wake up from Sleep Idle mode 0 P P P P U U U Bit Name EXIE5 TCIE2 ADIE X EXIE3 TCIE4 SPIE TCIE3 Power on 0 0 0 U 0 0 0 0 RESET and WDT time out 0 0 0 U 0 0 0 0...

Страница 49: ...U U U P P Bit Name P97 P96 P95 P94 P93 P92 P91 P90 Power on 1 1 1 1 1 1 1 1 RESET and WDT time out 1 1 1 1 1 1 1 1 0x09 Port 9 Wake Up from Sleep Idle mode P P P P P P P P Bit Name TC4FF1 TC4FF0 TC4S...

Страница 50: ...DDL Wake up from Sleep Idle mode P P U P 0 P P P Bit Name TC2D15 TC2D14 TC2D13 TC2D12 TC2D11 TC2D10 TC2D9 TC2D8 Power On 0 0 0 0 0 0 0 0 RESET and WDT time out 0 0 0 0 0 0 0 0 0x09 TC2DH Wake up from...

Страница 51: ...P P P P P P P P Register Bank 3 Address Name Reset Type Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit Name SMP DCOL BRS2 BRS1 BRS0 EDS DORD WBE Power on 0 0 0 0 0 0 0 0 RESET and WDT time out P...

Страница 52: ...nd P of the Status Register The values of T and P are used to verify the event that triggered the processor to wake up Table 7 shows the events that may affect the status of T and P Table 7 The Values...

Страница 53: ...1 TBEF 0015 6 Internal UART Receive ENI URIE 1 TBFF 0018 7 Internal UART Receive error ENI UERRIE 1 UERRIF 001B 8 Internal TC3 ENI TCIE3 1 TCIF3 0021 9 Internal SPI ENI SPIE 1 SPIF 0024 10 Internal TC...

Страница 54: ...frequencies of the crystal resonator under different VDDs is listed below Table 10 Oscillator Modes Defined by SDCS and OSC Mode OSC Oscillator 1 High frequency oscillator Single Clock 0 ERC Table 11...

Страница 55: ...809N Fig 5 30 Crystal Resonator Circuit Table12 Capacitor Selection Guide for Crystal Oscillator or Ceramic Resonator Oscillator Type Frequency Mode Frequency C1 pF C2 pF 2 0 MHz 20 40 20 40 Ceramic R...

Страница 56: ...ries slightly from one chip to another due to the manufacturing process variation In order to maintain a stable system frequency the values of the Cext should not be less than 20pF and the value of Re...

Страница 57: ...Code Option Register The EM78P312N has one CODE option word that is not part of the normal program memory The option bits cannot be accessed during normal program execution Code Option Register and C...

Страница 58: ...oltage Detector POVD with a detecting level of 2 1V It will work well if VDD rises fast enough 10 ms or less In many critical applications however additional components are required to provide solutio...

Страница 59: ...replaced device power VDD is taken off but residue voltage remains The residue voltage may trip below VDD minimum but not to zero This condition may cause a poor power on reset Fig 35 and Fig 36 show...

Страница 60: ...K is low and four oscillator clocks if CLK is high Note that once the 4 oscillator periods within one instruction cycle is selected as in Case A the internal clock source to TCC should be CLK Fosc 4 n...

Страница 61: ...R 1 A skip if zero None 0 0101 11rr rrrr 05rr DJZ R R 1 R skip if zero None 0 0110 00rr rrrr 06rr RRCA R R n A n 1 R 0 C C A 7 C 0 0110 01rr rrrr 06rr RRC R R n R n 1 R 0 C C R 7 C 0 0110 10rr rrrr 0...

Страница 62: ...Rating Temperature under bias 40 C to 85 C Storage temperature 65 C to 150 C Input voltage 0 3V to 6 0V Output voltage 0 3V to 6 0V Operating Frequency 2clk DC to 10MHz 6 2 Recommended Operating Condi...

Страница 63: ...hreshold Voltage Schmitt Trigger RESET TCC INT 0 7 VDD VDD 0 3V V VILT1 Input Low Threshold Voltage Schmitt Trigger RESET TCC INT 0 3V 0 3 VDD V VIHX1 Clock Input High Voltage OSCI in crystal mode 0 7...

Страница 64: ...ESET TCC 0 7 VDD VDD 0 3V V VILT2 Input Low Threshold Voltage Schmitt Trigger RESET TCC 0 3V 0 3 VDD V VIHX1 Clock Input High Voltage LOSCI OSCI in crystal mode 0 7 VDD VDD 0 3V V VILX1 Clock Input Lo...

Страница 65: ...rent VDD VAREF 5 0V VASS 0 0V V reference from VREF 200 250 300 A RN Resolution VDD VAREF 5 0V VASS 0 0V 9 10 Bits LN Linearity error VDD 2 5 to 5 5V Ta 25 C 0 1 2 LSB DNL Differential nonlinear error...

Страница 66: ...2000 ns Twdt Watchdog timer period Ta 25 C 11 3 16 2 21 6 ms Tset Input pin setup time 0 ns Thold Input pin hold time 20 ns Tdelay Output pin delay time Cload 20pF 50 ns Tstup1 SDI data setup time Se...

Страница 67: ...tice 7 3 Timing Diagram RESET Timing CLK 0 CLK RESET NOP Instruction 1 Executed Tdrh TCC Input Timing CLKS 0 CLK TCC Ttcc Tins AC Testing Input is driven at 2 4V for logic 1 and 0 4V for logic 0 Timin...

Страница 68: ...EM78P312NAK SDIP 28 300 mil EM78P312NM SOP 28 300 mil EM78P312NS SSOP 28 209 mil Y S J Green product does not contain hazardous substances The third edition of Sony SS 00259 standard Pb content shoul...

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