w77e58 Winbond Electronics Corp America, w77e58 Datasheet - Page 19

• Manufacturer Part Number: w77e58
• Description: 8 Bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

SERIAL DATA BUFFER
SBUF.7-0: Serial data on the serial port 0 is read from or written to this location. It actually consists of
PORT 2
P2.7-0: Port 2 is a bi-directional I/O port with internal pull-ups. This port also provides the upper
PORT 4
P4.3-0: Port 4 is a bi-directional I/O port with internal pull-ups.
INTERRUPT ENABLE
EA:
ES1:
ET2:
ES:
ET1:
EX1:
ET0:
EX0:
address bits for accesses to external memory.
Global enable. Enable/disable all interrupts except for PFI.
Enable Serial Port 1 interrupt.
Enable Timer 2 interrupt.
Enable Serial Port 0 interrupt.
Enable Timer 1 interrupt
Enable external interrupt 1
Enable Timer 0 interrupt
Enable external interrupt 0
two separate internal 8-bit registers. One is the receive resister, and the other is the
transmit buffer. Any read access gets data from the receive data buffer, while write access
is to the transmit data buffer.
Mnemonic: P2
Mnemonic: P4
Mnemonic: IE
Mnemonic: SBUF
Bit:
Bit:
Bit:
Bit:
SBUF.7 SBUF.6 SBUF.5 SBUF.4 SBUF.3 SBUF.2 SBUF.1 SBUF.0
P2.7
EA
7
7
7
7
-
P2.6
ES1
6
6
6
6
-
P2.5
ET2
- 19 -
5
5
5
5
-
P2.4
ES
4
4
4
4
-
Preliminary W77E58
Publication Release Date: March 1999
P2.3
P4.3
ET1
3
3
3
3
Address: A0h
Address: A5h
Address: A8h
Address: 99h
P2.2
P4.2
EX1
2
2
2
2
P2.1
P4.1
ET0
1
1
1
1
Revision A1
P2.0
P4.0
EX0
0
0
0
0