w79e532 Winbond Electronics Corp America, w79e532 Datasheet - Page 15

• Manufacturer Part Number: w79e532
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

P4.0 Base Address Low Byte Register
P4.0 Base Address High Byte Register
P4.1 Base Address Low Byte Register
P4.1 Base Address High Byte Register
Serial Port Control
SM0/FE: Serial port 0, Mode 0 bit or Framing Error Flag: The SMOD0 bit in PCON SFR determines
SM1:
SM2:
Multiple processors communication. Setting this bit to 1 enables the multiprocessor
communication feature in mode 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, the SM2 bit controls the serial port
clock. If set to 0, then the serial port runs at a divide by 12 clock of the oscillator. This gives
Serial port Mode bit 1:
whether this bit acts as SM0 or as FE. The operation of SM0 is described below. When
used
as FE, this bit will be set to indicate an invalid stop bit. This bit must be manually cleared in
software to clear the FE condition.
SM0
Mnemonic: P40AL
Mnemonic: P40AH
Mnemonic: P41AL
Mnemonic: P41AH
Mnemonic: SCON
0
0
1
1
Bit:
Bit:
Bit:
Bit:
Bit:
SM1
0
1
0
1
SM0/FE
A15
A15
A7
A7
7
7
7
7
7
Mode
0
1
2
3
SM1
A14
A14
A6
A6
6
6
6
6
6
Description
Synchronous
Asynchronous
Asynchronous
Asynchronous
SM2
A13
A13
A5
A5
5
5
5
5
5
- 15 -
REN
Length
A12
A12
A4
A4
10
11
11
4
4
4
4
4
8
Publication Release Date: November 21, 2005
A11
A11
TB8
W79E532/W79L532
A3
A3
3
3
3
3
3
Address: 94h
Address: 95h
Address: 96h
Address: 97h
Address: 98h
Baud rate
Variable
64/32 Tclk
Variable
4/12 Tclk
RB8
A10
A10
A2
A2
2
2
2
2
2
A1
A9
A1
A9
TI
1
1
1
1
1
Revision A5
A0
A0
A8
A8
RI
0
0
0
0
0