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¡ SemiconductorMSM80C154S/83C154S
"End of serial port reception" interrupt request flag.
This flag must be reset by software during interrupt service routine.
This flag is set after the eighth bit of data has been received when in mode 0, or
by the STOP bit when in any other mode.
In mode 2 or 3, however, RI is not set if the RB8 data is "0" with SM2 = "1".
RI is set in mode 1 if STOP bit is received when SM2 = "1".
NAME
ADDRESS
MSB LSB
76543210
BIT LOCATION FLAG FUNCTION
SCON 98H SM0 SM1 SM2 REN TB8 RB8 TI RI
SCON.0 RI
"End of serial port tramsmission" interrupt request flag. This flag must be reset
by software during interrupt service routine.
This flag is set after the eighth bit of data has been sent when in mode 0, or after
the last bit of data has been sent when in any other mode.
SCON.1 TI
The TB8 data is sent as the ninth data bit when in mode 2 or 3.
Any desired data can be set in TB8 by software.
SCON.3 TB8
SCON.6 SM1 SM0 SM1
8-bit shift register I/O
00
8-bit UART variable baud rate
01
9-bit UART 1/32 XTAL1, 1/64 XTAL1 baud rate
10
9-bit UART variable baud rate
11
SCON.7 SM0
The ninth bit of data received in mode 2 or 3 is passed to RB8.
The STOP bit is applied to RB8 if SM2 = "0" when in mode 1.
RB8 can not be used in mode 0.
SCON.2 RB8
Reception enable control bit.
No reception when REN = "0".
Reception enabled when REN = "1".
SCON.4 REN
If the ninth bit of received data is "0" with SM2 = "1" in mode 2 or 3, the "end of
reception" signal is not set in the RI flag.
The "end of reception" signal set in the RI flag if the STOP bit is not "1" when
SM2 = "1" in mode 1.
SCON.5 SM2
MODE
0
1
2
3
Serial port control register (SCON)