7540 datasheet(46/88 Pages) RENESAS

46 / 88 page

7540 Group

Rev.4.00

Jun 21, 2004

page 46 of 82

REJ03B0011-0400Z

Fig. 51 Block diagram of internal clock generating circuit (for ceramic resonator)

Fig. 52 Block diagram of internal clock generating circuit (for RC oscillation)

1/2

1/4

1/2

WIT

instruction

STP instruction

Timing

(Internal clock)

STP instruction

Interrupt request

Reset

Interrupt disable flag l

High-speed mode

Middle-speed mode

Prescaler 1

Timer 1

Clock division

ratio selection bit

Double-speed mode

On-chip oscillator mode

On-chip oscillator

RING

XOUT

XIN

1/8

Clock division ratio selection bit

Middle-, high-, low-speed mode

On-chip oscillator mode

RESET

1/2

1/4

1/2

WIT

instruction

STP instruction

Timing

(Internal clock)

STP instruction

Interrupt request

Reset

Interrupt disable flag l

High-speed mode

Middle-speed mode

Prescaler 1

Timer 1

Clock division

ratio selection bit

Double-speed mode

On-chip oscillator mode

On-chip oscillator

RING

XOUT

XIN

Delay

1/8

Clock division ratio selection bit

Middle-, high-, low-speed mode

On-chip

oscillator

mode

RESET

7540 Datasheet(PDF) 46 Page - Renesas Technology Corp

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