P80C557E6EFB 查看數據表（PDF） - Philips Electronics
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P80C557E6EFB Datasheet PDF : 64 Pages
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Philips Semiconductors
Single-chip 8-bit microcontroller
Product specification
P83C557E6/P80C557E6
7
6
5
4
3
2
1
0
S0CON (98H)
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
Figure 28. Serial port control (S0CON) register.
Table 22. Description of S0CON bits
SYMBOL
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
BIT
S0CON.7
S0CON.6
S0CON.5
S0CON.4
S0CON.3
S0CON.2
S0CON.1
S0CON.0
FUNCTION
This bit is used to select the serial port mode. See Table 23
This bit is used to select the serial port mode. See Table 23
Enables the multiprocessor communication feature in modes 2 and 3. In mode 2 or 3, if SM2 is set to
1, then RI will not be activated if the received 9th data bit (RB8) is 0. In mode 1, if SM2 = 1, then RI will
not be activated if a valid stop bit was not received. In mode 0, SM2 should be 0.
Enables serial reception. Set by software to enable reception. Clear by software to disable reception.
The 9th data bit that will be transmitted in modes 2 and 3. Set or clear by software as desired.
In modes 2 and 3, RB8 is the 9th data bit that was received. In mode 1, if
SM2 = 0, RB8 is the stop bit that was received. In mode 0, RB8 is not used.
The transmit interrupt flag. Set by hardware at the end of the 8th bit time in mode 0, or at the beginning
of the stop bit in the other modes, in any serial transmission. Must be cleared by software.
The receive interrupt flag. Set by hardware at the end of the 8th bit time in mode 0, or halfway through
the stop bit time in the other modes, in any serial reception (except see SM2). Must be cleared by
software.
Table 23. Description of S0CON bits
SM0
0
0
1
1
SM1
0
1
0
1
MODE
0
1
2
3
DESCRIPTION
Shift register
8–bit UART
9–bit UART
9–bit UART
BAUD RATE
fCLK/12
variable
fCLK/64 or fCLK/32
variable
1999 Mar 02
29
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