EM73P968 datasheet(27/53 Pages) EMC

27 / 53 page

* This specification are subject to be changed without notice.

EM73P968

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

8.14.2001

Preliminary

FUNCTION OF HIGH SPEED COUNTER

The HTC has auto load timer mode.

The HTC is disabled when the CPU is reseted or in the SLOW/STOP/IDLE operation mode. Users

must enable it by self when the CPU is waked up.

Auto load timer mode

In this mode, there are four different internal pulse rates can be selected by P20. The HTC loads the

initial values by the counter registers (P12, P13) and increases at the rising edges of internal pulse generated

by the time base. The value of TCB increases one when the high speed counter overflows and generates

an overflow interrupt (TRGB) when the TCB overflows. This mode is only available for NORMAL operation

mode.

PROGRAM EXAMPLE :

LDIA

#00H

; initial TCB & HTC register

STATBL

STATBM

STATBH

OUTA

P13

OUTA

P12

LDIA

#1011B

; enable timer mode, internal pulse rate : CLK/27

OUTA

P20

LDIA

#00H

; disable timer mode

OUTA

P20

INA

P12

; store the counter value to RAM[00] - RAM[04]

STA

00H

INA

P13

STA

01H

LDATBL

STA

02H

LDATBM

STA

03H

LDATBH

STA

04H

EM73P968 Datasheet(PDF) 27 Page - ELAN Microelectronics Corp

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