M38047F2HKP datasheet(273/387 Pages) RENESAS

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2-149

APPLICATION

2.12 Standby function

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

2.12 Standby function

The 3804 group (Spec. H) is provided with standby functions to stop the CPU by software and put the CPU

into the low-power operation.

The following two types of standby functions are available.

•Stop mode using STP instruction

•Wait mode using WIT instruction

2.12.1 Stop mode

The stop mode is set by executing the STP instruction. In the stop mode, the oscillation of both clocks (XIN–

XOUT, XCIN–XCOUT) stop and the internal clock

φ stops at the “H” level. The CPU stops and peripheral units

stop operating. As a result, power dissipation is reduced.

(1)

State in stop mode

Table 2.12.1 shows the state in the stop mode.

Table 2.12.1 State in stop mode

Item

Oscillation

CPU

Internal clock

I/O ports P0–P6

Timer

PWM

Watchdog timer

Serial I/O1, Serial I/O2, Serial I/O3

I2C-BUS interface

A/D converter

D/A converter

State in stop mode

Stopped.

Stopped at “H” level.

Retains the state at the STP instruction execution.

Stopped. (Timers 1, 2, X, Y, Z)

However, Timers X, Y, Z can be operated in the event counter

mode.

Stopped.

However, these can be operated only when an external clock

is selected.

Stopped.

Retains output voltage.

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