M30620FCAFP datasheet(34/274 Pages) MITSUBISHI

34 / 274 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock Generating Circuit

Figure 1.10.2. Examples of sub-clock

Table 1.10.1. Main clock and sub-clock generating circuits

Clock Generating Circuit

The clock generating circuit contains two oscillator circuits that supply the operating clock sources to the

CPU and internal peripheral units.

Example of oscillator circuit

Figure 1.10.1 shows some examples of the main clock circuit, one using an oscillator connected to the

circuit, and the other one using an externally derived clock for input. Figure 1.10.2 shows some examples

of sub-clock circuits, one using an oscillator connected to the circuit, and the other one using an externally

derived clock for input. Circuit constants in Figures 1.10.1 and 1.10.2 vary with each oscillator used. Use

the values recommended by the manufacturer of your oscillator.

Figure 1.10.1. Examples of main clock

Main clock generating circuit

Sub-clock generating circuit

Use of clock

• CPU’s operating clock source

• Internal peripheral units’

• Timer A/B’s count clock

operating clock source

source

Usable oscillator

Ceramic or crystal oscillator

Crystal oscillator

Pins to connect oscillator

XIN, XOUT

XCIN, XCOUT

Oscillation stop/restart function

Available

Oscillator status immediately after reset

Oscillating

Stopped

Other

Externally derived clock can be input

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.

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

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