UPD78F9418A NEC, UPD78F9418A Datasheet - Page 197

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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(3)
Cautions on UART mode
(a)
(b)
When RXE00 is set to 0 at the timing indicated by <1>, RXB00 holds the previous data and does not
generate INTSR00.
When RXE00 is set to 0 at the timing indicated by <2>, RXB00 renews the data and does not generate
INTSR00.
When RXE00 is set to 0 at the timing indicated by <3>, RXB00 renews the data and generates INTSR00.
When bit 7 (TXE00) of asynchronous serial interface mode register 00 (ASIM00) is cleared during
transmission, be sure to set transmit shift register 00 (TXS00) to FFH, then set the TXE00 bit to 1
before executing the next transmission.
When bit 6 (RXE00) of asynchronous serial interface mode register 00 (ASIM00) is cleared during
reception, receive buffer register 00 (RXB00) and the reception completion interrupt (INTSR00) are as
follows.
INTSR00
RxD pin
RXB00
CHAPTER 13 SERIAL INTERFACE 00
User’s Manual U13952EJ3V0UD
Parity
<1>
<3>
<2>
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