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ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 14 Port 3
14-5
14.2.4 Port 3 Control Registers 0, 1 (P3CON0, P3CON1)
Address: 0F21AH
Access: R/W
Access size: 8/16 bit
Initial value: 00H
7 6 5 4 3 2 1 0
P3CON0
⎯ ⎯
P35C0
⎯ ⎯ ⎯ ⎯ ⎯
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
Address: 0F21BH
Access: R/W
Access size: 8-bit
Initial value: 00H
7 6 5 4 3 2 1 0
P3CON1
⎯ ⎯
P35C1
⎯ ⎯ ⎯ ⎯ ⎯
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0
P3CON0 and P3CON1 are special function registers (SFRs) to select input/output state of the Port 3 pin. The
input/output state is different between input mode and output mode. Input or output is selected by using the P3DIR
register.
[Description of Bits]
•
P35C1, P35C0 (bit 5)
P35C1 and P35C0 are the bit bits for selecting the high-impedance output, P-channel open drain output,
N-channel open drain output, or CMOS output in output mode and for selecting the high-impedance input, input
with a pull-down resistor, or input with a pull-up resistor in input mode.
Setting of P35 pin
When output mode is selected (P35DIR bit
= “0”) When input mode is selected (P35DIR bit
= “1”)
P35C1 P35C0 Description
0 0
P35 pin: High-impedance output (initial
value) P35 pin: High-impedance input
0 1 P35 pin: P-channel open drain output P35 pin: Input with a pull-down resistor
1 0 P35 pin: N-channel open drain output P35 pin: Input with a pull-up resistor
1 1 P35 pin: CMOS output P35 pin: High-impedance input