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MSM80C154S/83C154S/85C154HVS
102
Table 4-15 SCON
Bit Symbol Function
0
1
2
3
4
5
6
7
RI
TI
RB8
TB8
REN
SM2
SM1
SM0
"End of reception" flag. This is the interrupt request flag set by
hardware when reception of one frame has been completed. The
interrupt is generated by ORing with the T1 flag. Since the flag
cannot be cleared by hardware, it must be cleared by software.
"End of transmission" flag. This is the interrupt request flag set by
hardware when transmission of one frame has been completed.
The interrupt is generated by ORing with the RI flag.
Since the flag cannot be cleared by hardware, it must be cleared
by software.
Storage of the 9th bit of the data received during 11-bit frame
UART mode (mode 2 or 3). When in 10-bit frame UART mode
(mode 1), the stop bit is stored.
Storage of the 9th bit of the data to be sent during 11-bit frame
UART mode (mode 2 or 3).
Receive enable bit. Reception is not activated if REN is not set..
If SM2 is set when in 11-bit frame UART mode (mode 2 or 3) and
the 9th bit of the received data is "1", the received data is accepted
and loaded into SBUF and RB8, and the RI flag is set. If the 9th bit
of the received data is "0", on the other hand, the received data is
disregarded and the SBUF, RB8, and RI flags remain unchanged.
This function is used to enable communication between
processors in multi-processor systems.
If SM2 is set when in 10-bit frame UART mode (mode 1) and the
normal stop bit cannot be received (stop bit "0"), the received data
is disregarded, and the SBUF, RB8, and RI flags remain
unchanged. When SM2="0", however, the sent data is received
irrespective of the "0"/"1" status of the stop bit.
SM2 must be cleared when in I/O extension mode (mode 0).
Used in setting serial port operation mode. See Table 4-16.
Used in setting serial port operation mode. See Table 4-16.