3886 datasheet(154/380 Pages) RENESAS

154 / 380 page

3886 Group User’s Manual

APPLICATION

2-37

2.3 Timer

Fig. 2.3.20 Control procedure

(address 2316)

(address 2016)

(address 2116)

(address 2616)

(address 2716)

(address 3E16), bit6

RESET

SEI

PRE12

PREY

ICON1

CLI

IREQ1(address 3C 16), bit5 ?

RTI

TY (address 2716)

(A)

214 < (A) < 228

Fpulse

(address 2716)

IREQ1

(address 3C16), bit5

256 – 1

(address 2316), bit7

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

•All interrupts disabled

•Timer Y operating mode : Event counter mode

(Count a falling edge of pulses input from CNTR 1 pin.)

•Division ratio set so that Timer 1 interrupt will occur at

2 ms intervals.

•Timer Y count start

•Interrupts enabled

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

Note 2: When using Decimal mode flag (D)

•Push registers used in interrupt process routine

•Pop registers pushed to stack

•Counter value initialized

•Timer Y interrupt request bit cleared

Initialization

1110XXXX2

64 – 1

8 – 1

1 – 1

256 – 1

•Timer 1 interrupt enabled

Timer 1 interrupt process routine

CLT (Note 1)

CLD (Note 2)

Push registers to stack

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

•Count value read

•Count value into Accumulator (A) stored

In range

Out of range

•Read value with reference value

compared

•Comparison result to flag Fpulse

stored

Process judgment result

Pop registers

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