7630 datasheet(91/238 Pages) RENESAS

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APPLICATION

2.3 Timers

2-25

7630 Group User’s Manual

Control procedure : Figure 2.3.10 shows a control procedure.

Fig. 2.3.10 Control procedure [Clock function]

RESET

Initialization

SEI

T123M [Address: 001916]

ICONB [Address: 000616], bit 5

T1 [Address: 001616]

T3 [Address: 001816]

CLI

CPUM [Address: 000016]

00000X002

0100XXXX2

250 – 1

50 – 1

Main processing

IREQB [Address: 000316], bit 5

T1 [Address: 001616]

T3 [Address: 001816]

[Processing for completion of setting clock]

250 – 1

50 – 1

(Note 1)

Timer 3 interrupt processing routine

CLT (Note 2)

CLD (Note 3)

Push registers to the stack area

Clock stop?

Clock count up (1/40 second to year)

Pop registers from the stack area

RTI

•

φ = f(XIN) divided by 2 (high-speed mode)

• Select each count source of the Timer 1 and Timer 3.

• Set “division ratio – 1” to the Timer 1 and Timer 3.

• Interrupts : Enabled

Note 1: This processing is performed only

at completing to set the clock.

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

Note 3: When using the Decimal mode flag (D).

• Push the registers used in the interrupt processing routine

on the stack.

• When restarting the clock from zero second

after completing to set the clock, reset timers.

• Set the Timer 3 interrupt request bit to “0”.

• Check if the clock has already been set.

• Count up the clock.

• Pop registers which are pushed on the stack.

X : These bits are not used in this application.

Please set these bits to “0” or “1” appropriately.

• All interrupts : Disabled

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