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502
CHAPTER 17 UART
17.7.2
Operation in Synchronous Mode (Operation Mode 2)
The clock synchronous transfer method is used for UART operation mode 2 (normal
mode).
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Operation in Synchronous Mode (Operation Mode 2)
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Transfer data format
In synchronous mode, 8-bit data is transferred using the LSB first method, in which start and stop bits are
not added. Figure 17.7-3 shows the data format in clock synchronous mode.
Figure 17.7-3 Transfer Data Format (Operation Mode 2)
●
Clock supply
In clock synchronous mode (I/O extended serial), as many clocks as the number of transmission and
reception bits must be supplied.
•
When the internal clock (dedicated baud rate generator or internal timer) is selected, the data receiving
synchronous clocks is generated automatically if data is transmitted.
•
When the external clock is selected, confirm that the transmission side UART output data register
(SODR0/SODR1) contains data (SSR0/SSR1: TDRE = 0). Then, clocks for just 1 byte must be
supplied from outside.
The mark level (H) must be retained before transmission starts and after it is complete.
●
Error detection
Only overrun errors can be detected; parity and framing errors cannot be detected.
Transmission data writing
Mark level
(Mode 2)
01001101
B
is transferred.
Transmitting and reception
RXE, TXE
Transmission and reception
1
0
1
1
1
0
0
0
MSB
LSB
data
clock
Содержание MB90460 Series
Страница 1: ...The following document contains information on Cypress products ...
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Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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