3886 datasheet(149/380 Pages) RENESAS

149 / 380 page

2-32

3886 Group User’s Manual

APPLICATION

2.3 Timer

Fig. 2.3.13 Control procedure

(address 2316)

(address 3C16)

(address 3E16), bit4

RESET

Initialization

SEI

IREQ1

ICON1

PREX

CLI

256 – 1

Main processing

PREX

IREQ1

256 – 1

Clock stop ?

RTI

(address 2316), bit3

(address 2416)

(address 2516)

(address 3C16), bit4

(address 2316), bit3

CLT (Note 2)

CLD (Note 3)

Push registers to stack

(address 2416)

(address 2516)

(address 2316), bit3

(Note 1)

Timer X interrupt process routine

Clock count up (1/4 second to year)

Pop registers

xxxx1x002

•All interrupts disabled

•Timer X operating mode : Timer mode

•Timer X interrupt request bit cleared

•Timer X interrupt enabled

•“Division ratio – 1” set to Prescaler X and Timer X

•Timer X count start

•Interrupts enabled

•Timer X count stop

•Timer reset to restart count from 0 second after completion of

clock set

•Timer X count start

Note 2: When using Index X mode flag (T)

Note 3: When using Decimal mode flag (D)

•Push registers used in interrupt process routine

•Judgment whether clock stops

•Clock counted up

•Pop registers pushed to stack

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

xxx0xxxx2

Note 1: Perform procedure for completion of clock set only

when completing clock set.

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