SM59A16U1
8-Bit Micro-controller
64KB with ISP Flash
& 6K+256B RAM embedded
5. GPIO
The SM59A16U1 has four I/O ports: Port 0, Port 1, Port 2, Port 3 and Port 4. Ports 0, 1, 2, 3, are 8-bit ports and Port 4
is a 6-bit port. These are: quasi-bidirectional (standard 8051 port outputs), push-pull, open drain, and input-only. Two
configuration registers for each port select the output type for each port pin. All I/O port pins on the SM59A16U1 may
be configured by software to one of four types on a pin-by-pin basis, shown as below:
Mnemonic
Description
Dir.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
RST
I/O port function register
P0M0
P0M1
P1M0
P1M1
P2M0
P2M1
P3M0
P3M1
Port 0 output mode 0
Port 0 output mode 1
Port 1 output mode 0
Port 1 output mode 1
Port 2 output mode 0
Port 2 output mode 1
Port 3 output mode 0
Port 3 output mode 1
D2h
D3h
D4h
D5h
D6h
D7h
DAh
DBh
P0M0 [7:0]
P0M1[7:0]
P1M0[7:0]
P1M1[7:0]
P2M0[7:0]
P2M1[7:0]
P3M0[7:0]
00H
00H
00H
00H
00H
00H
00H
00H
P3M1[7:0]
P4M P4M P4M P4M P4M P4M
P4M0
P4M1
Port 4 output mode 0
Port 4 output mode 1
DCh
DDh
-
-
-
-
00H
00H
0.6
P4M P4M P4M P4M P4M P4M
1.6 1.5 1.4 1.3 1.2 1.1
0.5
0.4
0.3
0.2
0.1
Note: P0 is input only, when reset assert (even P1M0 reset value is 00H).
PxM1.y
PxM0.y
Port output mode
0
0
1
1
0
1
0
1
Quasi-bidirectional (standard 8051 port outputs) (pull-up)
Push-pull
Input only (high-impedance)
Open drain
The OCI_SCL、ALE and OCI_SDA can be define as P4.4、P4.5 and P4.6 by writer or ISP。
For general-purpose applications, every pin can be assigned to either high or low independently as given below:
Mnemonic
Description
Dir.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Ports
RST
Port 0
Port 1
Port 2
Port 3
Port 4
Port 0
Port 1
Port 2
Port 3
Port 4
80h
90h
A0h
B0h
E8h
P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0
P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0
P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0
P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0
FFh
FFh
FFh
FFh
FFh
-
P4.6 P4.5 P4.4 P4.3 P4.2 P4.1
-
5.1
P0 ( Port 0 Register )
Mnemonic: P0
Address: 80h
7
P0.7
6
P0.6
5
P0.5
4
P0.4
3
P0.3
2
P0.2
1
P0.1
0
P0.0
Reset
FFh
P0.7~ 0: Port0 [7] ~ Port0 [0]
P1 ( Port 1 Register)
Mnemonic: P1
Specifications subject to change without notice contact your sales representatives for the most recent information.
5.2
Address: 90h
ISSFD-M071 Ver A SM59A16U1 04/12/2013
- 40 -
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
