Oki MSM80C154S, MSM83C154S manual Serial port control register Scon, Ren, Mode

MSM80C154S/83C154S							¡ Semiconductor
Serial port control register (SCON)
NAME	ADDRESS	MSB							LSB
		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	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.
SCON.3	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.
SCON.4	REN	Reception enable control bit.
		No reception when REN = "0".
		Reception enabled when REN = "1".
SCON.5	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	SM1	SM0	SM1	MODE
		0	0	0	8-bit shift register I/O
		0	1	1	8-bit UART variable baud rate
					9-bit UART 1/32 XTAL1, 1/64 XTAL1 baud rate
SCON.7	SM0	1	0	2
		1	1	3	9-bit UART variable baud rate

272