UPD17P228 datasheet(7/28 Pages) NEC

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µPD17P228

Data Sheet U14542EJ1V0DS00

FUNCTIONS

2.1 Normal Operation Mode

Pin No.

Symbol

Function

Output Format

At Reset

P0A0

P0A1

P0A2

P0A3

P0B0

P0B1

P0B2

P0B3

P0C0

P0C1

P0C2

P0C3

P0D0

P0D1

P0D2

P0D3

P0E0

P0E1

P0E2

P0E3

REM

RESET

9VDD

Power supply

GND

Ground

INT

External interrupt request signal input

WDOUT

XIN

Connects ceramic resonator for system clock oscillation

XOUT

IC1

These pins cannot be used.

IC2

Leave open.

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

Can be used for key return input of key matrix. When at least

one of these pins goes low, standby function is released.

4-bit input/output port.

Can be set in input or output mode in 1-bit units.

In output mode, this port functions as a high current CMOS output

port. In input mode, function as CMOS input and can be specified

to connect pull-up resistor by program.

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

Can be used for key source output of key matrix.

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

Can be used for key return input of key matrix. When at least

one of these pins goes low, standby function is released.

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

Can be used for key source output of key matrix.

–

Input

–

Input

System reset input. CPU can be reset when low-level signal is

input to this pin. While low-level signal is input, oscillator is

stopped. This pin connected to pull-up resistor by mask option.

Output detecting hang-up and drop in supply voltage. This pin

outputs at low level either when an overflow occurs in the watch-

dog timer, when an overflow/underflow occurs in the stack, or

when the supply voltage drops below a specified level. Connect

this pin to the RESET pin.

–

Input

––

–

Input

Outputs transfer signal for infrared remote controller.

Active-high output.

N-ch

Low-level

open-drain

output

N-ch

Low-level

open-drain

output

CMOS

Low-level

push-pull

output

–

(Oscillation

stops)

CMOS

push-pull

Input

High-

impedance

Low-level

output at low

voltage

detection

N-ch

open-drain

––

UPD17P228 Datasheet(PDF) 7 Page - NEC

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