UPD780076GC-XXX-AB8 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD780076GC-XXX-AB8

8-bit Single-chip Microcontroller

NEC => Renesas Technology 

CHAPTER 13 APPLICATIONS OF KEY INPUT

(2) Example of use

EXTRN KEYDATA,CHATCT,KEYIN

EXTBIT KEYCHG

VETM3 CSEG

DW

AT 1EH

INTTM3

MAINDAT DSEG SADDR

CT5MS: DS

1

.

.

..

TMC2=#00100110B

CLR1 TMMK3

CT5MS=#3

; Sets vector address of watch timer

PM3=#00000000B

SET1 PUO.4

CHATCT=#3

.

.

.

.

if_bit(KEYCHG)

CLR1 KEYCHG

; Key input processing

endif

...

.

;**********************************************

;

Watch timer interrupt processing

;

Interval time: 1.95 ms

;**********************************************

INTTM3:

...

.

DBNZ CT5MS,$RTNTM3

MOV

CT5MS,#3

CALL !ANKEYIN

RTNTM3:

.

...

RETI

; Sets P3 in output mode

; Pulls P4 up

; Initial setting of chattering counter

; Key changed?

; 1.95 ms interrupt

; 1.95 ms × 3 elapses

375

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