NEC PD78214 - Manual (Page 163)

134
µ
PD78214 Sub-Series
(c) External interrupt mode register 1 (INTM1)
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
X
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
X n+1
←CR02
RETI
Yn = CR02 – Xn
7
0 INTM1 0 Ч 1 1
6 5 4 3 2 1 0
Ч Ч Ч
Specifies valid edge of INTP3 input
to be rising and falling edges
× : Don't care