M38063M2AFP datasheet(30/58 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

3806 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Clock Generating Circuit

An oscillation circuit can be formed by connecting a resonator be-

tween XIN and XOUT. To supply a clock signal externally, input it to

the XIN pin and make the XOUT pin open.

Oscillation control

Stop Mode

If the STP instruction is executed, the internal clock

φ stops at an

“H”. Timer 1 is set to “0116” and prescaler 12 is set to “FF16”.

Oscillator restarts when an external interrupt is received, but the

internal clock

φ remains at an “H” until timer 1 underflow.

This allows time for the clock circuit oscillation to stabilize.

If oscillator is restarted by a reset, no wait time is generated, so

______

keep the RESET pin at an “L” level until oscillation has stabilized.

Wait Mode

If the WIT instruction is executed, the internal clock

φ stops at an

“H” level, but the oscillator itself does not stop. The internal clock

restarts if a reset occurs or when an interrupt is received.

Since the oscillator does not stop, normal operation can be started

immediately after the clock is restarted.

To ensure that interrupts will be received to release the STP or

WIT state, interrupt enable bits must be set to “1” before the STP

or WIT instruction is executed.

When the STP status is released, prescaler 12 and timer 1 will

start counting and reset will not be released until timer 1

underflows, so set the timer 1 interrupt enable bit to “0” before the

STP instruction is executed.

Fig. 27 Block diagram of clock generating circuit

Fig. 26 External clock input circuit

Fig. 25 Ceramic resonator circuit

COUT

XIN

XOUT

CIN

XIN

XOUT

Open

External oscillation

circuit

Vss

Vcc

1/8

XOUT

XIN

STP instruction

WIT

instruction

Reset

STP instruction

Timer 1

ONW

control

Prescaler 12

1/2

φ output

Internal clock

ONW pin

Single-chip mode

Reset

Interrupt request

Interrupt disable

flag (I)

FF16

0116

Reset or STP instruction

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