15

* This specification are subject to be changed without notice.

EM73201

4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT

Preliminary

7.20.1999

LDIA #01H;

STATAM;

LDIA #0FH;

STATAH;

LDIA #1000B;

NOTE: The preset value of timer/counter register is calculated as following procedure.

The number of internal pulse to get timer overflow = 60 ms/ 0.256ms = 234.375 = 0EAH

The preset value of timer/counter register = 1000H - 0EAH = 0F16H

PULSE WIDTH MEASUREMENT MODE

For the pulse width measurement mode, the counter only incresed by the rising edge of internal pulse rate as

external timer/counter input (P8.3/TRGA ), interrupt request will be generated as soon as timer/counter

overflow.

LDIA #1100B;

OUTA P28; Enable timerA with pulse width measurement mode.

INTERRUPT FUNCTION

There are 4 interrupt sources, 2 external interrupt sources, 2 internal interrupt sources . Multiple

interrupts are admitted according the priority .

Type

Interrupt source

Priority

Interrupt

Interrupt

Program ROM

Latch

Enable condition

entry address

External External interrupt(INT0)

1

IL5

EI=1

002h

Internal Reserved

2

IL4

EI=1, MASK3=1

004h

Internal TimerA overflow interrupt (TRGA) 3

IL3

EI=1, MASK2=1

006h

Internal Reserved

4

IL2

EI=1, MASK1=1

008h

Internal Time base interrupt(TBI)

5

IL1

00Ah

External External interrupt(INT1)

6

IL0

EI=1,MASK0=1

00Ch

Internal pulse

TimerA value

n

n+1

n+2

n+3

n+4

n+5

P8.3/TRGA