7477 datasheet(278/354 Pages) RENESAS

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7470/7471/7477/7478 GROUP USER’S MANUAL

APPLICATION

2.8 Low-power dissipation function

7470

7471

7477

7478

Fig. 2.8.2 Example of control procedure [Ordinary mode

→ Stop mode → Ordinary mode]

(1) Ordinary mode

→ Stop mode → Ordinary mode

Specifications: The stop mode is executed by the STP instruction.

Restoration to the ordinary mode is attained by INT0 interrupt.

Figure 2.8.2 shows an example of control procedure.

Clear the timer 3 interrupt enable bit (timer 3 interrupt disabled)

Clear the timer 4 interrupt enable bit (timer 4 interrupt disabled)

Stop the timer 3 and timer 4 and select the timer 3 count

source

(Set the Timer 34 mode register)

RTI

!! !

!! ! 11

Select the timer 3 count source

Set the interrupt disable flag (each interrupt disabled)

Clear the interrupt disable flag (each interrupt enabled)

INT0 interrupt

Set the return interrupt source

Clear the INT0 interrupt request bit

Execute the NOP instruction

Set the INT0 interrupt enable bit

(INT0 interrupt enabled)

Set the timer 3 and 4 count state

(Set the Timer 34 mode register)

!! !

!! ! 00 T34M (Address 00F916)

Timer 3 count

Timer 4 count

Execute the STP instruction

Clear the interrupt disable flag (each interrupt enabled)

Re-set the timer 3 and 4

Timer 34 mode register

Timer 3 register

Timer 4 register

T34M (Address 00F916)

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