7477 datasheet(179/354 Pages) RENESAS

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

1-162

HARDWARE

1.17 Low-power dissipation function

1.17.1 Stop mode

To switch to the stop mode, execute the STP instruction. In the stop mode, the oscillation of both f(XIN)

and f(XCIN) stops and the internal clock

φ stops.

Accordingly, the CPU stops and the peripheral units also stop. This leads to a reduction of power dissipation.

Note: In the 7470/7477 group, the f(XCIN) is not available.

(1) State of stop mode

Table 1.17.1 shows a state of stop mode.

Note: When the STP instruction is executed, “FF16” and “0716” are automatically set in timer 3 and

timer 4, respectively.

Table 1.17.1 State of stop mode

State of stop mode

Stop

State at execution STP

instruction is held.

When internal count source selected : Stop

When external count source selected : Operate

Internal clock mode: Stop

External clock mode: Operate

Held

Held (except timer3, timer4)

Held

+ CPU register :

The following 6 registers are incorporated in the

CPU.

• Accumulator

• Index register X

• Index register Y

• Stack pointer

• Program counter

• Processor status register

Item

Oscillation

CPU

I/O port P0 to P5

Timer

Serial I/O

RAM

SFR

CPU register +

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