Electronics America Computer Hardware User Manual

134

PD78214 Sub-Series

Fig. 7-33 Setting Procedure for Pulse Width Measurement

Fig. 7-34 Interrupt Request Handling for Pulse Width Calculation

Pulse width

measurement

Set CRC0 register

Set INTM1 register and

MK0L register

CRC0←10H

0←0

CE0←1

Initialize buffer memory for capture value

Start counting

; Sets bit 3 of TMC0 to 1

Enable interrupt

INTP3 interrupt

; Specifies valid edge of

INTP3 input to be both

edges and unmasks interrupt

INTP3 interrupt

Calculation of pulse width

Store captured value in memory

Xn+1←CR02

RETI

Yn = CR02 – Xn

INTM1

0 × 11

6543210

×××

Specifies valid edge of INTP3 input

to be rising and falling edges

: Don't care