38K2 datasheet(179/358 Pages) RENESAS

179 / 358 page

2.3 Timer

Rev.2.00

Oct 15, 2006

page 30 of 112

38K2 Group

REJ09B0338-0200

APPLICATION

Fig. 2.3.12 Control procedure

RESET

Initialization

Main processing

Clock stop ?

RTI

(address 2316), bit3

← 1

PREX

(address 2416)

← 30 – 1

(address 2516)

← 125 – 1

IREQ1

(address 3C16), bit5

← 0

(address 2316), bit3

← 0

CLT (Note 2)

CLD (Note 3)

Push registers to stack

(Note 1)

Timer X interrupt process routine

Clock count up (1/100 second to year)

Pop registers

•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.

Note 1: Perform procedure for completion of clock set only

when completing clock set.

SEI

(address 2316)

← xxxx1x002

IREQ1

(address 3C16)

← xx0xxxxx2

ICON1

(address 3E16), bit5

← 1

PREX

(address 2416)

← 30 – 1

(address 2516)

← 125 – 1

(address 2316), bit3

← 0

CLI

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