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CHAPTER 17 UART
17.8
Usage Notes on UART
Notes on using UART are given below.
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Notes on using UART
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Enabling operations
In UART, the control register (SCR0/SCR1) has both TXE (transmission) and RXE (reception) operation
enable bits. Both transmission and reception operations must be enabled before the transfer starts because
they have been disabled as the default value (initial value). The transfer can also be canceled by disabling
its operation as required.
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Communication mode setting
Set the communication mode while the system is not operating. If the mode is set during transmission or
reception, the transmission or reception data is not guaranteed.
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Synchronous mode
UART clock synchronous mode (operation mode 2) uses clock control (I/O extended serial) mode, in
which start and stop bits are not added to the data.
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Transmission interrupt enabling timing
The default (initial value) of the transmission data empty flag bit (SSR0/SSR1: TRE) is "1" (no
transmission data and transmission data write enable state). A transmission interrupt request is generated
as soon as the transmission interrupt requests are enabled (SSR0/SSR1: TIE = 1). Be sure to set the TIE
flag to "1" after setting the transmission data.
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......