W78ERD2 Datasheet, PDF (15/72 Pages) Winbond – 8-BIT MICROCONTROLLER

W78ERD2
Port 1
Bit:
7
P1.7
6
P1.6
5
P1.5
4
P1.4
3
P1.3
2
P1.2
1
P1.1
0
P1.0
Mnemonic: P1
Address: 90h
P1.7-0: General purpose Input/Output port. Most instructions will read the port pins in case of a port
read access, however in case of read-modify-write instructions, the port latch is read. These alternate
functions are described below:
Port 4.1 Low Address Comparator
Bit:
7
6
5
4
3
2
1
0
P41AL.7 P41AL.6 P41AL.5 P41AL.4 P41AL.3 P41AL.2 P41AL.1 P41AL.0
Mnemonic: P41AL
Address: 94h
Port 4.1 High Address Comparator
Bit:
7
6
5
4
3
2
1
0
P41AH.7 P41AH.6 P41AH.5 P41AH.4 P41AH.3 P41AH.2 P41AH.1 P41AH.0
Mnemonic: P41AH
Address: 95h
Serial Port Control
Bit:
7
6
5
4
3
2
1
0
SM0/FE SM1 SM2 REN TB8 RB8
TI
RI
Mnemonic: SCON
Address: 98h
BIT NAME
FUNCTION
Serial port 0, Mode 0 bit or Framing Error Flag: The SMOD0 bit in PCON SFR
7
SM0/FE
determines 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.
Serial port Mode bit 1:
Mode: SM0 SM1 Description Length Baud rate
0 0 0 Synchronous
6 SM1
1 0 1 Asynchronous
8 4/12 Tclk
10 Variable
2 1 0 Asynchronous
11 64/32 Tclk
3 1 1 Asynchronous
11 Variable
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Publication Release Date: April 20, 2005
Revision A4