LAPIS Semiconductor ML610472, User Manual

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ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 14 Port 3
14-1
14. Port 3
14.1 Overview
This LSI includes Port 3 (P35), which is a 1-bit input/output port.
Furthermore, the oscillation pin (RCM) for the RC-ADC (Channel 1) are provided as the secondary function mode.
For the RC-ADC, see Chapter 17, “RC Oscillation Type A/D Converter”.
14.1.1 Features
•
Allows selection of high-impedance output, P-channel open drain output, N-channel open drain output, or CMOS
output for each bit in output mode.
•
Allows selection of high-impedance input, input with a pull-down resistor, or input with a pull-up resistor for
each bit in input mode.
•
The oscillation pin (RCM) for the RC-ADC (Channel 1) are available as the secondary function mode.
14.1.2 Configuration
Figure 14-1 shows the configuration of Port 3.
P3D : Port 3 data register
P3DIR : Port 3 direction register
P3CON0 : Port 3 control register 0
P3CON1 : Port 3 control register 1
P3MOD0 : Port 3 mode register 0
Figure 14-1 Configuration of Port 3
14.1.3 List of Pins
Pin name I/O Primary function Secondary function
P35/RCM I/O Input/output port RC oscillation monitor pin for RC-ADC1
Data bus
Output for RC-ADC (RCM)
P35
P3DIR
P3MOD0
P3CON0,1
V
DD
V
DD
V
SS
V
SS
1
1
Port3
Output
Controller
P3D
V
DD
V
SS
Pull-up
Pull-down
Controller
1