tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 244

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

16.12 Status Flag
16. Asynchronous Serial Interface (UART)
RA001
16.12.4Receive Data Buffer Full
RXD0 pin input
UART0SR<RBFL>
INTRXD0 interrupt request
Reading of UART0SR
Reading of RD0BUF
RD0BUF
RD0BUF is read subsequently.
when RD0BUF is read subsequently. In this case, UART0SR<RBFL> will be cleared to "0" when UART0SR
is read again and RD0BUF is read.
Loading the received data in RD0BUF sets UART0SR<RBFL> to "1".
If UART0SR<RBFL> is "1" when UART0SR is read, UART0SR<RBFL> will be cleared to "0" when
If UART0SR<RBFL> is set to "1" after UART0SR is read, UART0SR<RBFL> will not be cleared to "0"
Figure 16-15 Occurrence of Receive Data Buffer Full
Start Bit1
Bit0
Data A
Bit7 Stop Start Bit0
Data A
Page 230
Reading of data A
Bit1
Data B
Bit7 Stop
Data B
Reading of data B
RBFL is cleared to “0” when
RD0BUF is read after
reading RBFL=“1”.
TMP89FM42