UPD17P218 datasheet(9/32 Pages) RENESAS

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µPD17P218

PIN FUNCTIONS

2.1

IN NORMAL MODE

4-bit N-ch open-drain output port.

Can be used for key source output of key matrix. This

port retains output level immediately before standby

mode is set when standby mode is set, and outputs low

level on reset.

4-bit N-ch open-drain output port.

Can be used for key source output of key matrix. This

port retains output level immediately before standby

mode is set when standby mode is set, and outputs low

level on reset.

4-bit I/O port which can be set in input or output mode

in bit units.

In output mode, this port serves as high-current CMOS

output port.

In input mode, it serves as CMOS input port to which

pull-up resistor can be connected by program in bit

units. On reset, this port is set as input port.

Infrared remote controller transmission output pin.

Outputs low level on reset.

System reset input pin. By inputting low level to this pin,

CPU can be reset. While low level is input to this pin,

oscillation circuit stops oscillating.

RESET pin of

µPD17P218 is provided with pull-up

resistor.

Positive power supply pin

Ground

External interrupt request input

Output for detection of hang-up or voltage drop.

Outputs low level when watchdog timer overflows, when

stack overflows/underflows, or when low voltage is de-

tected. Connect this pin to RESET pin.

Connect ceramic oscillator for system clock oscillation

across these pins.

Pin No.

Symbol

Function

Output Format

On Reset

P0A0

P0A1

P0A2

P0A3

P0B0

P0B1

P0B2

P0B3

P0C0

P0C1

P0C2

P0C3

P0D0

P0D1

P0D2

P0D3

P0E0

P0E1

P0E2

P0E3

REM

CMOS push-pull

Low-level output

RESET

—

Input

9VDD

——

GND

——

INT

—

Input

WDOUT

N-ch open-drain

XIN

—

(Oscillation stops)

XOUT

4-bit CMOS input port with pull-up resistor.

Can be used for key return input of key matrix. This port

can release standby mode when at least one of pins goes

low.

4-bit CMOS input port with pull-up resistor.

Can be used for key return input of key matrix. This port

can release standby mode when at least one of pins goes

low.

N-ch open-drain

Low-level output

N-ch open-drain

Low-level output

CMOS push-pull

Input

—

Input

—

Input

High-impedance or

low-level output

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