M38B53M4-059FP datasheet(115/355 Pages) MITSUBISHI

115 / 355 page

38B5 Group User’s Manual

APPLICATION

2-27

2.2 Timer

Fig. 2.2.24 Control procedure

SEI

T12M

T34M

ICON1

ICON2

T12M

CLI

00XX10X12

3F16

0X10XX0X2

FF16

IREQ2 (address 3D16), bit0 ?

RTI

T4 (address 2316)

(A)

214 < (A) < 228

Fpulse

(address 2816)

(address 2016)

(address 2916)

(address 2316)

(address 3E16),bit5

(address 3F16),bit0

(address 2816), bit0

IREQ2

FF16

(address 2316)

(address 3D16), bit0

1/8

RESET

q X: This bit is not used here. Set it to “0” or “1” arbitrary.

•All interrupts disabled

Initialization

Timer 1 interrupt process routine

CLT (Note 1)

CLD (Note 2)

Push registers to stack

Out of range

Process judgment result

Pop registers

•Set division ratio so that Timer 1 interrupt will occur at 244

µs intervals.

•External pulses input from CNTR1 pin selected as Timer 4’s count source

•Setting Timer 4 count value

•Timer 1 interrupt enabled

•Timer 4 interrupt disabled

•Timer 1 count start

•Interrupts enabled

•Set so that pulse judgment process will be performed once each time

Timer 1 interrupt occurs 8 times, at 2 ms intervals.

Note 1: When using Index X mode flag (T)

Note 2: When using Decimal mode flag (D)

•Pushing registers used in interrupt process routine

•Popping registers pushed to stack

•Initialization of counter value

•Timer 4 interrupt request bit cleared

•Processing as out of range when the count value is 256 or more

•Count value read

•Storing count value into Accumulator (A)

•Compare the read value with

reference value.

•Store the comparison result to flag Fpulse.

In range

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