MSM80C154S Datasheet, PDF (14/40 Pages) OKI electronic componets – CMOS 8-bit Microcontroller

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MSM80C154S/83C154S
Serial port control register (SCON)
MSB
LSB
NAME
ADDRESS
7
6
5
4
3
2
1
0
SCON
98H
SM0 SM1 SM2 REN TB8 RB8
TI
RI
BIT LOCATION FLAG
FUNCTION
SCON.0
RI
"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".
SCON.1
TI
"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.2
SCON.3
SCON.4
SCON.5
RB8 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.
TB8 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.
REN Reception enable control bit.
No reception when REN = "0".
Reception enabled when REN = "1".
SM2 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.6
SCON.7
SM1
SM0 SM1 MODE
0
0
0 8-bit shift register I/O
0
1
1 8-bit UART variable baud rate
SM0
1
0
2 9-bit UART 1/32 XTAL1, 1/64 XTAL1 baud rate
1
1
3 9-bit UART variable baud rate
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