M16CSLASH62P datasheet(60/349 Pages) MITSUBISHI

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Clock Generation Circuit

Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

Externally derived clock

Open

Vcc

Vss

Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive

capacity setting. Use the value recommended by the maker of the oscillator.

When the oscillation drive capacity is set to low, check that oscillation is stable. Also, if the oscillator manufacturer's

data sheet specifies that a feedback resistor be added external to the chip, insert a feedback resistor between XCIN

and XCOUT following the instruction.

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

(Note)

CCIN

CCOUT

RCd

Figure 1.9.8. Examples of Sub Clock Connection Circuit

(2) Sub Clock

The sub clock is generated by the sub clock oscillation circuit. This clock is used as the clock source for

the CPU clock, as well as the timer A and timer B count sources. In addition, an fc clock with the same

frequency as that of the sub clock can be output from the CLKOUT pin.

The sub clock oscillator circuit is configured by connecting a crystal resonator between the XCIN and

XCOUT pins. The sub clock oscillator circuit contains a feedback resistor, which is disconnected from the

oscillator circuit during stop mode in order to reduce the amount of power consumed in the chip. The sub

clock oscillator circuit may also be configured by feeding an externally generated clock to the XCIN pin.

Figure 1.9.8 shows the examples of sub clock connection circuit.

After reset, the sub clock is turned off. At this time, the feedback resistor is disconnected from the oscilla-

tor circuit.

To use the sub clock for the CPU clock, set the CM07 bit of CM0 register to “1 ” (sub clock) after the sub

clock becomes oscillating stably.

During stop mode, all clocks including the sub clock are turned off. Refer to “power control”.

M16C/62P Datasheet(PDF) 60 Page - Mitsubishi Electric Semiconductor

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