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481
CHAPTER 17 UART
Table 17.4-3 Functions of Each Bit of Status Register (SSR0/SSR1)
Bit name
Function
bit15
PE:
Parity error flag bit
•
This bit is set to "1" when a parity error occurs during reception and is cleared when
"0" is written to the RFC bit of the mode control register (SMR0/SMR1).
•
A reception interrupt request is output when this bit and the RIE bit are "1".
•
Data in input data register (SIDR0/SIDR1) is invalid when this flag is set.
bit14
ORE:
Overrun error flag bit
•
This bit is set to "1" when an overrun error occurs during reception and is cleared
when "0" is written to the RFC bit of the mode control register (SMR0/SMR1).
•
A reception interrupt request is output when this bit and the RIE bit are "1".
•
Data in the input data register (SIDR0/SIDR1) is invalid when this flag is set.
bit13
FRE:
Framing error flag bit
•
This bit is set to "1" when a framing error occurs during reception and is cleared
when "0" is written to the RFC bit of the mode control register (SMR0/SMR1).
•
A reception interrupt request is output when this bit and the RIE bit are "1".
•
Data in the input data register (SIDR0/SIDR1) is invalid when this flag is set.
bit12
RDRF:
Receive data full flag
bit
•
This flag indicates the status of the input data register (SIDR0/SIDR1).
•
This bit is set to "1" when receive data is loaded into SIDR0/SIDR1 and is cleared
to "0" when input data register SIDR0/SIDR1 is read.
•
A reception interrupt request is output when this bit and the RIE bit are "1".
bit11
TDRE:
Transmission data
empty flag bit
•
This flag indicates the status of output data register (SODR0/SODR1).
•
This bit is cleared to "0" when transmission data is written to SODR0/SODR1 and
is set to "1" when data is loaded into the transmission shift register and transmission
starts.
•
A transmission interrupt request is output when this bit and the RIE bit are "1".
(Note)
This bit is set to "1" (SODR0/SODR1 empty) as its initial value.
bit10
BDS:
Transfer direction
selection bit
•
This bit selects whether to transfer serial data from the least significant bit (LSB
first, BDS = 0) or the most significant bit (MSB first, BDS = 1).
(Note)
The high-order and low-order sides of serial data are interchanged with each other
during reading from or writing to the serial data register. If this bit is set to another
value after the data is written to the SDR register, the data becomes invalid.
bit9
RIE:
Reception interrupt
request enable bit
•
This bit enables or disables input of a request for transmission interrupt to the CPU.
•
A reception interrupt request is output when this bit and the receive data flag bit
(DRRF) are 1 or this bit and one or more error flag bits (PE, ORE and FRE) are "1".
bit8
TIE:
Transmission interrupt
request enable bit
•
This bit enables or disables output of a request for transmission interrupt to the
CPU.
•
A transmission interrupt request is output when this bit and the TDRE bit are "1".
Содержание MB90460 Series
Страница 1: ...The following document contains information on Cypress products ...
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Страница 9: ...iv ...
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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