Datasheet

CHAPTER 2 PIN FUNCTIONS

User’s Manual U18698EJ1V0UD

2.2.4 P40 (port 4)

P40 functions as a 1-bit I/O port. These pins also function as pins for key interrupt input and power supply voltage

for driving the LCD.

The following operation modes can be specified in 1-bit units.

(1) Port mode

P40 functions as a 1-bit I/O port. P40 can be set to input port or output port in 1-bit units using port mode register

4 (PM4). Use of an on-chip pull-up resistor can be specified by pull-up resistor option register 4 (PU4).

(2) Control mode

P40 functions as key interrupt input and power supply voltage for driving the LCD.

(a) KR0

This is the key interrupt input pins.

(b) V

LC3

This is the power supply voltage pins for driving the LCD.

2.2.5 P100, P101 (port 10)

P100 and P101 function as a 2-bit I/O port. These pins also function as segment signal output pins for the LCD

controller/driver. Either I/O port function or segment signal output function can be selected using port function register

ALL (PFALL).

(1) Port mode

P100 and P101 function as a 2-bit I/O port. P100 and P101 can be set to input or output port in 1-bit units using

port mode register 10 (PM10). Use of an on-chip pull-up resistor can be specified by pull-up resistor option

(2) Control mode

P100 and P101 function as segment signal output for the LCD controller/driver.

(a) SEG4, SEG5

These pins are the segment signal output pins for the LCD controller/driver.

2.2.6 P112, P113 (port 11)

P112 and P113 function as a 2-bit I/O port. These pins also function as pins for segment signal output pins for the

LCD controller/driver and serial interface data I/O. Either I/O port function (other than segment signal output) or

segment signal output function can be selected using port function register ALL (PFALL).

(1) Port mode

P112 and P113 function as a 2-bit I/O port. P112 and P113 can be set to input or output port in 1-bit units using

port mode register 11 (PM11). Use of an on-chip pull-up resistor can be specified by pull-up resistor option

(2) Control mode

P112 and P113 function as segment signal output for the LCD controller/driver and serial interface data I/O.