參數(shù)資料
型號(hào): P80CE559
廠商: NXP Semiconductors N.V.
英文描述: Single-chip 8-bit microcontroller(8位單片微控制器)
中文描述: 單芯片8位微控制器(8位單片微控制器)
文件頁(yè)數(shù): 29/72頁(yè)
文件大小: 524K
代理商: P80CE559
Philips Semiconductors
Preliminary specification
P83CE559/P80CE559
Single-chip 8-bit microcontroller
1996 Aug 06
29
Figure 28. Serial port control (S0CON) register.
7
6
5
4
3
2
1
0
S0CON (98H)
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
Table 22.
Description of S0CON bits
SYMBOL
BIT
FUNCTION
SM0
S0CON.7
This bit is used to select the serial port mode. See Table 23
SM1
S0CON.6
This bit is used to select the serial port mode. See Table 23
SM2
S0CON.5
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.
REN
S0CON.4
Enables serial reception. Set by software to enable reception. Clear by software to disable reception.
TB8
S0CON.3
The 9th data bit that will be transmitted in modes 2 and 3. Set or clear by software as desired.
RB8
S0CON.2
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.
TI
S0CON.1
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.
RI
S0CON.0
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
SM1
MODE
DESCRIPTION
BAUD RATE
0
0
0
Shift register
f
CLK
/12
variable
0
1
1
8–bit UART
1
0
2
9–bit UART
f
CLK
/64 or f
CLK
/32
variable
1
1
3
9–bit UART
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