D17133CS datasheet(142/289 Pages) NEC

142 / 289 page

CHAPTER 13

PERIPHERAL HARDWARE

127

Figure 13-6. Reading 8-Bit Counter Count Values

The timer counter value is F0H.

GET DBF, TMC; Example of using reserved words DBF and TMC

Data Buffer

DBF3

Retained

8-bit data

GET DBF, TMC

DBF2

Retained

DBF1

DBF0

TMC (Peripheral Address 02H)

Count value

(2) Program example

• Measuring pulse width input from INT pin (system clock: fX=8 MHz)

The following is an example of measuring generation interval of external interrupt from INT pin by using

timer. At this time the pulse width from INT pin should be within the count-up time of timer.

(Program example)

CNTTMH

MEM

0.30H

; Symbol definition of save area of count value

CNTTML

MEM

0.31H

;

ORG

00H

; Specifies vector address of interrupt

MAIN

;

ORG

03H

;

INTJOB

;

INITIAL:

INITFLG

IP, NOT IPTM, NOT IPSIO

; Prohibits interrupts other than external interrupt

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