
649
Chapter 32 USART (LIN / FIFO)
7.USART Operation
If transmission interrupt is enabled (TIE = 1), the interrupt is generated by the TDRE flag. Note, that the initial
value of the TDRE flag is "1", so that in this case if TIE is set to "1" an interrupt will occur immediately.
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Reception Operation
Reception operation is performed every time it is enabled by the Reception Enable (RXE) flag bit of the
SCR04. If a start bit is detected, a data frame is received according to the format specified by the SCR04. By
occurring errors, the corresponding error flags are set (PE, ORE, FRE). However after the reception of the
data frame the data is transferred from the serial shift register to the Reception Data Register (RDR04) and
the Receive Data Register Full (RDRF) flag bit of the SSR5 is set. The data then has to be read by the CPU.
By doing so, the RDRF flag is cleared. If reception interrupt is enabled (RIE = 1), the interrupt is simply
generated by the RDRF.
Note: Only when the RDRF flag bit is set and no errors have occurred the Reception Data Register (RDR04)
contains valid data.
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Stop Bit, Error Detection, and Parity
For transmission, 1 or 2 stop bits can be selected. During reception, if selected, both stop bits are checked, to
set the reception bus idle (RBI) flag of ECCR04 correctly after the second stop bit.
In mode 0 parity, overrun, and framing errors can be detected.
In mode 1, overrun and framing errors can be detected. Parity is not provided.
By setting the Parity Enable (PEN) bit of the Serial Control Register (SCR04) the USART provides parity
calculation (during transmission) and parity detection and check (during reception) in mode 0 (and mode 2 if
the SSM bit of ECCR04 is set).
Even parity is set, if the P bit of SCR04 is cleared, odd parity if the flag bit is set. In mode 1, overrun and
framing errors can be detected. Parity is not provided.
■
Signal mode NRZ and RZ
To set USART to the NRZ data format set the ECCR04:INV bit to 0 (initial value).
RZ data format is set, if the ECCR04:INV bit was set to 1.
7.2 Operation in Synchronous Mode (Operation Mode 2)
The clock synchronous transfer method is used for USART operation mode 2 (normal mode).
■
Transfer data format (standard synchronous)
In the synchronous mode, 8-bit data is transferred with no start or stop bits if the SSM bit of the Extended
Communication Control Register (ECCR04) is 0. A special clock signal belongs to the data format in mode 2.
The figure below illustrates the data format during a transmission in the synchronous operation mode
Figure 7-2 Transfer data format (operation mode 2).
Transmission data
writing
Transmitting or
receiving clock
Transmission and
reception data
0 1 1 0 1 0 0 1
Data
LSB
MSB
Mark level
(normal)
Transmitting
clock (SCDE = 1)
Mark level
Mark level
Reception data sample edge (SCES = 0)
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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