M30102 datasheet(21/164 Pages) RENESAS

21 / 164 page

Under

development

Tentative Specifications REV.E1

Specifications in this manual are tentative and subject to change.

Mitsubishi microcomputers

M30100/M30102 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Sub clock

CM0i : Bit i at address 000616

CM1i : Bit i at address 000716

CM2i : Bit i at address 000C16

WDCi : Bit i at address 000F16

CM10 “1”

Write signal

WAIT instruction

Main clock

Interrupt request

level judgment output

RESET

Software reset

Details of divider

CM04

fC32

XCIN

1/32

XCOUT

XOUT

CM05

XIN

1/2

CM06=0

CM17,CM16=00

CM06=0

CM17,CM16=01

CM06=0

CM17,CM16=10

CM06=1

CM06=0

CM17,CM16=11

1/2

Main

clock

switching

circuit

Ring

oscillator

oscillation

circuit

CM20

Oscillation

stop detection

CM22

CM07=0

fAD

f32

BCLK

CM07=1

CM02

1/2

fRING

Divider

fMAIN

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

Externally derived clock

Open

Vcc

Vss

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

(Note)

CCIN

CCOUT

RCd

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.

Clock Generating Circuit

A ring oscillator is built into the microcomputer. The oscillation of the ring oscillator can be used as the

BCLK by setting the main clock select bit (bit 2 of address 000C). Lower power consumption can be

realized because the oscillating frequency of the ring oscillator is much lower compared to that of XIN. The

frequency of the ring oscillator depends on the supply voltage and the operation temperature range. Be

careful that variable frequencies and obtain the sufficient margin when designing application products.

Clock Control

Figure 1.8.3 shows the block diagram of the clock generating circuit.

Figure 1.8.2. Examples of sub-clock

Figure 1.8.3. Clock generating circuit

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