M83 datasheet(71/441 Pages) MITSUBISHI

71 / 441 page

Under

development

Rev.B2 for proof reading

Mitsubishi Microcomputers

M32C/83 group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock Generating Circuit

(1) Main clock

The main clock is a clock source for CPU operation and peripheral I/O. Figure 1.8.6 shows example of a

main clock. When a reset, the clock oscillates and after a reset, the clock is divided by 8 to the BCLK

(CPU operating clock).

(a) Main clock On/Off function

• Main clock (XIN-XOUT) stop bit of system control register 0 (bit 5 at address 000616)

0: Main clock On

1: Main clock Off

Also, the clock is stopped by shifting to the stop mode.

• All clock stop control bit of system control register 1 (bit 0 at address 000716)

0: Clock on

1: All clocks off (stop mode)

Figure 1.8.6. Examples of main clock

Microcomputer

(Built-in feedback resistance)

XIN

XOUT

Externally derived clock

Open

Vcc

Vss

Microcomputer

(Built-in feedback resistance)

XIN

XOUT

CIN

COUT

(Note)

Note: Insert a damping resistance if required. The resistance will vary depending on

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

Insert a feedback resistance between XIN and XOUT when an oscillation

manufacture required.

M83 Datasheet(PDF) 71 Page - Mitsubishi Electric Semiconductor