M16CSLASH62P datasheet(59/349 Pages) MITSUBISHI

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Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock Generation Circuit

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

Microcomputer

(Built-in feedback resistor)

XIN

XOUT

Externally derived clock

Open

Vcc

Vss

Microcomputer

(Built-in feedback resistor)

XIN

XOUT

CIN

COUT

(Note)

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 XIN

and XOUT following the instruction.

Figure 1.9.7. Examples of Main Clock Connection Circuit

The following describes the clocks generated by the clock generation circuit.

(1) Main Clock

This clock is used as the clock source for the CPU and peripheral function clocks. This clock is used as

the clock source for the CPU and peripheral function clocks. The main clock oscillator circuit is configured

by connecting a resonator between the XIN and XOUT pins. The main 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 main clock oscillator circuit may also be configured by

feeding an externally generated clock to the XIN pin. Figure 1.9.7 shows the examples of main clock

connection circuit.

After reset, the main clock divided by 8 is selected for the CPU clock.

The power consumption in the chip can be reduced by setting the CM05 bit of CM0 register to “1” (main

clock oscillator circuit turned off) after switching the clock source for the CPU clock to a sub clock or ring

oscillator clock. In this case, XOUT goes “H”. Furthermore, because the internal feedback resistor remains

on, XIN is pulled “H” to XOUT via the feedback resistor. Note that if an externally generated clock is fed into

the XIN pin, the main clock cannot be turned off by setting the CM05 bit to “1”. If necessary, use an

external circuit to turn off the clock.

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

M16C/62P Datasheet(PDF) 59 Page - Mitsubishi Electric Semiconductor

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