參數(shù)資料
型號(hào)： P80CL51
廠商： NXP Semiconductors N.V.
英文描述： Low voltage 8-bit microcontrollers with UART
中文描述： 低電壓的8位微控制器的UART的
文件頁數(shù)： 21/68頁
文件大小： 305K
代理商： P80CL51
1997 Apr 15
21
Philips Semiconductors
Product specification
Low voltage 8-bit microcontrollers with
UART
P80CL31; P80CL51
Table 5
Serial Port Control Register (address 98H)
Table 6
Description of S0CON bits
Table 7
Selection of the serial port modes
7
6
5
4
3
2
1
0
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
BIT
SYMBOL
DESCRIPTION
7
6
5
SM0
SM1
SM2
These bits are used to select the serial port mode; see Table 7.
Enables the multiprocessor communication feature in Modes 2 and 3. In these modes, if
SM2 = 1, then RI will not be activated if the received 9
th
data bit (RB8) is a logic 0.
In Mode 1, if SM2 = 1, then RI will not be activated unless a valid stop bit was received.
In Mode 0, SM2 should be a logic 0.
Enables serial reception and is set by software to enable reception, and cleared by
software to disable reception.
Is the 9
th
data bit that will be transmitted in Modes 2 and 3; set or cleared by software as
desired.
In Modes 2 and 3, is the 9
th
data bit received. In Mode 1, if SM2 = 0 then 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 8
th
bit time in Mode 0, or
at the beginning of the stop bit time 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 8
th
bit time in Mode 0, or
halfway through the stop bit time in the other modes, in any serial transmission (except
see SM2). Must be cleared by software.
4
REN
3
TB8
2
RB8
1
TI
0
RI
SM0
SM1
MODE
DESCRIPTION
BAUD RATE
0
0
1
1
0
1
0
1
Mode 0
Mode 1
Mode 2
Mode 3
Shift register
8-bit UART
9-bit UART
9-bit UART
1
12
×
f
osc
variable
1
32
or
1
64
×
f
osc
variable
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