
10-2
ML63326 User's Manual
Chapter 10 Ports (INPUT, OUTPUT, I/O PORT)
10.3 Port 0 (P0.0–P0.3)
10.3.1 Port 0 Configuration
The ML63326 has Port 0, a 4-bit input-only port.
Figure 10-1 shows the configuration of port 0.
Pull-up/
pull-down
control
P0CON0
P0CON1
4
4
V
DDI
4
P0.0–P0.3
V
SS
Read P0D
4
4
P0.0–P0.3
(to external interrupt 5
control circuit)
Data bus
Figure 10-1 Input-Only Port (Port 0) Configuration
10.3.2 Port 0 Registers
(1) Port 0 Data Register (P0D)
The port 0 data register (P0D) is a 4-bit read-only special function register (SFR) used to read
the pin levels of each bit of port 0.
P03
P02
P01
P00
P0D (000H)
(R)
bit 3
bit 2
bit 1
bit 0
Pin levels of each bit of port 0
0: "L" level
1: "H" level
Содержание ML63326
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