Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User’s Manual
Chapter 19 Port 2
FEUL620Q504 19–6
19.2.4 Port 2 Control Register (P2CON)
Address: 0F222H
Access: R/W
Access size: 8/16 bits
Initial value: 0000H
7 6 5 4 3 2 1 0
P2CON0 – – – – P23C0 P22C0 P21C0 P20C0
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
15 14 13 12 11 10 9 8
P2CON1 – – – – P23C1 P22C1 P21C1 P20C1
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
P2CON0 and P2CON1 are special function registers (SFRs) to select input/output state of the Port 2 pin. The
input/output state is different between input mode and output mode. Input or output is selected by using the P2DIR
register.
Description of Bits
•
P23-20C1 (bits 3 to 0) , P23-20C0 (bits 11 to 8)
The P27-20C1 pins and the P27-20C0 pins are used to select high-impedance output, P-channel open drain output,
N-channel open drain output, or CMOS output in output mode and to select high-impedance input, input with a
pull-down resistor, or input with a pull-up resistor in input mode.
Setting of P20 pin
When output mode is selected
(P20DIR bit = “0”)
When input mode is selected
(P20DIR bit = “1”)
P20C1 P20C0 Description
0 0 High-impedance output (initial value) High-impedance input
0 1 P-channel open drain output Input with a pull-down resistor
1 0 N-channel open drain output Input with a pull-up resistor
1 1 CMOS output High-impedance input
Setting of P21 pin
When output mode is selected
(P21DIR bit = “0”)
When input mode is selected
(P21DIR bit = “1”)
P21C1 P21C0 Description
0 0 High-impedance output (initial value) High-impedance input
0 1 P-channel open drain output Input with a pull-down resistor
1 0 N-channel open drain output Input with a pull-up resistor
1 1 CMOS output High-impedance input
Setting of P22 pin
When output mode is selected
(P22DIR bit = “0”)
When input mode is selected
(P22DIR bit = “1”)
P22C1 P22C0 Description
0 0 High-impedance output (initial value) High-impedance input
0 1 P-channel open drain output Input with a pull-down resistor
1 0 N-channel open drain output Input with a pull-up resistor
1 1 CMOS output High-impedance input