654
Chapter 32 USART (LIN / FIFO)
7.USART Operation
Figure 7-7 LIN bus timing and USART signals
7.4 Direct Access to Serial Pins
USART allows the user to access directly the transmission pin (SOT04) or the reception pin (SIN04).
■
USART Direct Pin Access
The USART provides the ability for the user to directly access the serial input or output pin. The software can
always monitor the incoming serial data by reading the SIOP bit of the ESCR04. If setting the Serial Output
Pin direct access Enable (SOPE) bit of the ESCR04 the software can force the SOT04 pin to a desired value.
Note, that this access is only possible, if the transmission shift register is empty (i. e. no transmission activity).
In LIN mode this function can be used for reading back the own transmission and is used for error handling if
something is physically wrong with the single-wire LIN-bus.
(Note)
Write the desired value to the SIOP pin before enabling the output pin access, to prevent undesired
peaks. The peaks can occur because SIOP holds the last written value.
During a Read-Modify-Write operation the SIOP bit returns the actual value of the SOT04 pin in the read cycle
instead the value of SIN04 during a normal read instruction.
LIN
bus
RXE
LBD
(IRQ0)
LBIE
RDRF
RIE
old serial clock
no clock used
(calibration frame)
new (calibrated) serial clock
LIN break detected and Interrupt
IRQ from ICU
IRQ from ICU
Reception enable
Edge of Start bit of Identifier byte
Byte read in RDR
RDR read by CPU
ICU count
Reception Interrupt enable
LIN break begins
Read
RDR
by CPU
(SIN)
(IRQ0)
LBIE disable
Internal
IRQ from
IRQ cleared by CPU (LBD -> 0)
ICU
IRQ cleared: Begin of Input Capture
IRQ cleared: Calculate & set new baud rate
Signal
to ICU
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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