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參數資料
| 型號： | P89C739ABB |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit Flash microcontrollers |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 20 MM, 2.70 MM HEIGHT, PLASTIC, SOT-319-1, QFP-64 |
| 文件頁數： | 27/64頁 |
| 文件大?。?/td> | 360K |
| 代理商： | P89C739ABB |
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1998 Apr 07
27
Philips Semiconductors
Product specification
8-bit Flash microcontrollers
P89C738; P89C739
12.2
Serial Port Control Register (SCON)
Table 17
Serial Port Control Register (SFR address 98H)
Table 18
Description of SCON bits
Table 19
Selection of the Serial Port modes
7
6
5
4
3
2
1
0
SMO
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 19.
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 9th 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
. Set and cleared by software as required.
The 9th data bit that will be transmitted in Modes 2 and 3
. Set or cleared by software
as required.
In Modes 2 and 3, RB8 is the 9th 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.
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 time in the other modes, in any serial transmission. TI must
be cleared by software.
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 transmission (except:
see SM2). RI must be cleared by software.
4
3
REN
TB8
2
RB8
1
TI
0
RI
SMO
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
clk
variable
1
32
or
1
64
f
clk
variable
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