M16CSLASH62P datasheet(63/349 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.

CPU Clock and Peripheral Function Clock

Two type clocks: CPU clock to operate the CPU and peripheral function clocks to operate the peripheral

functions.

(1) CPU Clock and BCLK

These are operating clocks for the CPU and watchdog timer.

The clock source for the CPU clock can be chosen to be the main clock, sub clock, ring oscillator clock or

the PLL clock.

If the main clock or ring oscillator clock is selected as the clock source for the CPU clock, the selected

clock source can be divided by 1 (undivided), 2, 4, 8 or 16 to produce the CPU clock. Use the CM06 bit in

CM0 register and the CM17 to CM16 bits in CM1 register to select the divide-by-n value.

When the PLL clock is selected as the clock source for the CPU clock, the CM06 bit should be set to “0”

and the CM17 to CM16 bits to “002” (undivided).

After reset, the main clock divided by 8 provides the CPU clock.

During memory expansion or microprocessor mode, a BCLK signal with the same frequency as the CPU

clock can be output from the BCLK pin by setting the PM07 bit of PM0 register to “0” (output enabled).

Note that when entering stop mode from high or middle speed mode, ring oscillator mode or low power

ring oscillator mode, or when the CM05 bit of CM0 register is set to “1” (main clock turned off) in low-

speed mode, the CM06 bit of CM0 register is set to “1” (divide-by-8 mode).

(2) Peripheral Function Clock(f1, f2, f8, f32, f1SIO, f2SIO, f8SIO, f32SIO, fAD, fC32)

These are operating clocks for the peripheral functions.

Of these, fi (i = 1, 2, 8, 32) and fiSIO are derived from the main clock, PLL clock or ring oscillator clock by

dividing them by i. The clock fi is used for timers A and B, and fiSIO is used for serial I/O. The f8 and f32

clocks can be output from the CLKOUT pin.

The fAD clock is produced from the main clock, PLL clock or ring oscillator clock, and is used for the A-D

converter.

When the WAIT instruction is executed after setting the CM02 bit of CM0 register to “1” (peripheral

function clock turned off during wait mode), or when the microcomputer is in low power dissipation mode,

the fi, fiSIO and fAD clocks are turned off.

The fC32 clock is produced from the sub clock, and is used for timers A and B. This clock can be used

when the sub clock is on.

Clock Output Function

During single-chip mode, the f8, f32 or fC clock can be output from the CLKOUT pin. Use the CM01 to

CM00 bits of CM0 register to select.

M16C/62P Datasheet(PDF) 63 Page - Mitsubishi Electric Semiconductor