UPD78C14L 查看數據表（PDF） - NEC => Renesas Technology

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UPD78C14L

8-BIT SINGLE-CHIP MICROCONTROLLER (WITH A/D CONVERTER)

NEC => Renesas Technology 

µPD78C14(A)

2. PIN FUNCTIONS

2.1 Pin Function List

Pin

PA7-PA0

(Port A)

PB7-PB0

(Port B)

PC0/TxD

PC1/RxD

PC2/SCK

PC3/INT2/TI

PC4/TO

PC5/CI

PC6/CO0

PC7/CO1

PD7-PD0/

AD7-AD0

PF7-PF0/

AB15-AB8

WR

(Write

Strobe)

Input/Output

Input/Output

Input/Output

Input/Output,

Output

Input/Output,

Input

Input/Output,

Input/Output

Input/Output,

Input, Input

Input/Output,

Output

Input/Output,

Input

Input/Output,

Output

Input/Output,

Input/Output

Input/Output,

Output

Output

Function

These 8 pins constitute an 8-bit I/O port and input/output can be specified in bit

units.

These 8 pins constitute an 8-bit I/O port and input/output can be specified in bit

units.

Port C

Transmit Data

These 8 pins constitute an 8-bit I/O This pin outputs serial data.

port and input/output can be specified Receive Data

in bit units.

This pin inputs serial data.

Serial Clock

This pin inputs/outputs serial clock. It be-

comes an output pin when an internal

clock is used or an input pin when an

external clock is used.

Interrupt Request/Timer Input

This pin inputs edge triggering (falling

edge) maskable interrupt or external

clock for timer. This pin is also shared

with zero-cross detection pin for AC input.

Timer Output

This pin outputs square waves in which

one cycle of the internal clock forms a

half cycle, indicating the timer’s counting

time.

Counter Input

This pin inputs external pulse for timer/

event counter.

Counter Output 0,1

This pin outputs programmable square

wave by timer/event counter.

Port D

Address/Data Bus

These 8 pins constitute an 8-bit I/O These pins function as multiplexed

port and input/output can be

address/data bus when using an

specified in byte units.

external memory.

Port F

Address Bus

These 8 pins constitute an 8-bit I/O These pins function as address bus when

port and input/output can be specified using an external memory.

in bit units.

This is a strobe signal output to write data in external memory. This signal

becomes high level except during the data write machine cycle for external memory.

This signal becomes output high impedance when the RESET signal is low or in

the hardware STOP mode.

7

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