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M30201

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Mitsumi 

Clock Generating Circuit

Mitsubishi microcomputers

M30201 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock Generating Circuit

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

CPU and internal peripheral units.

Table 1.3. Main clock and sub-clock generating circuits

Use of clock

Usable oscillator

Pins to connect oscillator

Oscillation stop/restart function

Oscillator status immediately after reset

Other

Main clock generating circuit

Sub clock generating circuit

• CPU’s operating clock source • CPU’s operating clock source

• Internal peripheral units’

• Timer A/B/X’s count clock

operating clock source

source

Ceramic or crystal oscillator

Crystal oscillator

XIN, XOUT

XCIN, XCOUT

Available

Available

Oscillating

Stopped

Externally derived clock can be input

Example of oscillator circuit

Figure 1.15 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 1.16 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 15 and 16 vary with each oscillator used. Use the values

recommended by the manufacturer of your oscillator.

M30201

(Built-in feedback resistor)

XIN

XOUT

(Note)

Rd

CIN

COUT

M30201

(Built-in feedback resistor)

XIN

XOUT

Open

Externally derived clock

Vcc

Vss

Figure 1.15. Examples of main clock

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.

M30201

(Built-in feedback resistor)

XCIN

XCOUT

(Note)

RCd

CCIN

CCOUT

M30201

(Built-in feedback resistor)

XCIN

XCOUT

Open

Externally derived clock

Vcc

Vss

Figure 1.16. Examples of sub-clock

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.

18

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