M37544RSS datasheet(39/68 Pages) RENESAS

39 / 68 page

7544 Group

Rev.1.04

2004.06.08

page 39 of 66

REJ03B0012-0104Z

Fig. 48 State transition

Stop mode

Wait mode

WIT

instruction

Oscillation stop detection circuit valid

CPUM4

←12

MISRG1¨12

Interrupt

STP

instruction

WIT

instruction

Interrupt

MISRG1

←02

CPUM3¨12

CPUM3

←02

CPUM76¨102

CPUM76¨002

012

112

(Note 2)

CPUM4¨02

MISRG1¨12

MISRG1¨02

Reset released

State 1

Operation clock source:

f(XIN) (Note 1)

f(XIN) oscillation enabled

On-chip oscillator stop

State 2

Operation clock source:

f(XIN) (Note 1)

f(XIN) oscillation enabled

On-chip oscillator enabled

State 3

Operation clock source:

On-chip oscillator (Note 3)

f(XIN) oscillation enabled

On-chip oscillator enabled

State 4

Operation clock source:

On-chip oscillator (Note 3)

f(XIN) oscillation stop

On-chip oscillator enabled

Notes on switch of clock

(1) In operation clock source = f(XIN), the following can be

selected for the CPU clock division ratio.

● f(XIN)/2 (high-speed mode)

● f(XIN)/8 (middle-speed mode)

● f(XIN) (double-speed mode, only at a ceramic/quartz-crystal

oscillation)

(2) Execute the state transition state 3 to state 2 or

state 3’ to state 2’ after stabilizing XIN oscillation.

(3) In operation clock source = on-chip oscillator, the middle-

speed mode is selected for the CPU clock division ratio.

(4) When the state transition state 2

→ state 3 → state 4

is performed, execute the NOP instruction as shown below

according to the division ratio of CPU clock.

• CPUM76

→ 102 (State 2 → state 3)

• NOP instruction

• CPUM4

→ 12 (State 3 → state 4)

Double-speed mode at on-chip oscillator: NOP ✕ 3

High-speed mode at on-chip oscillator: NOP ✕ 1

Middle-speed mode at on-chip oscillator: NOP

Reset state

CPUM76¨102

CPUM76

←002

012

112

(Note 2)

State 2’

Operation clock source:

f(XIN) (Note 1)

f(XIN) oscillation enabled

On-chip oscillator enabled

State 3’

Operation clock source:

On-chip oscillator (Note 3)

f(XIN) oscillation enabled

On-chip oscillator enabled

M37544RSS Datasheet(PDF) 39 Page - Renesas Technology Corp

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