7733 datasheet(320/940 Pages) RENESAS

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STOP AND WAIT MODES

7733 Group User’s Manual

11–13

Operating

Stopped

Operating

11.4 Wait mode

When the WIT instruction is executed, internal clock

φ stops. (The oscillator does not stop oscillating.) This

state is called “wait mode.”

In the wait mode, power consumption can be lowered with Vcc (power source voltage) retained. Refer to

section “17.4 Power saving” for lowering the power consumption.

Table 11.4.1 lists the microcomputer’s state/operation in the wait mode and after the wait mode is terminated.

Table 11.4.2 lists the pin state in the wait mode.

Table 11.4.1 Microcomputer’s state/operation in wait mode and after wait mode is terminated

11.4 Wait mode

When terminated by inter-

rupt request occurrence

When terminated by

hardware reset

Supply of internal clock

φ starts

immediately after termination.

Operation after hardware reset

State in

wait mode

Operation

after wait

mode is

terminated

Stopped

Operating

Stopped

Operating

Refer to Table 11.4.2.

Oscillation

Internal clock

Clocks f2 to f512*1, clock

φ1*2

Clock

timer*3

Timer A, Timer B

Serial I/O

A-D converter

Watchdog timer

Pins

f(XIN)/32

f(XCIN)/32

Stopped

Operating

Item

Clocks f2 to f512∗1, clock

φ1∗2 : Refer to Figure 11.2.1.

Clock timer∗3 : Refer to section “7.6 Clock timer.”

g In order to select the state of clocks f2 to f512 in the wait mode, specify the system clock stop bit at wait state (bit 5

at address 6C16). (Refer to Figure 11.2.2 and section “11.4.1 State of clocks f2 to f512 in wait mode.”)

State/Operation

When clocks f2 to f512 are stopped When clocks f2 to f512 are not stopped

Operating enabled only in the

event counter mode.

Operating enabled only when

the external clock is selected.

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