7549 datasheet(53/86 Pages) RENESAS

53 / 86 page

Rev.2.02

Mar 31, 2009

Page 51 of 81

REJ03B0202-0202

7549 Group

Fig 66.

φSOURCE state transition

• XIN

HSOCO “S”

LSOCO “S”

xx10x011

XIN “O”

HSOCO “O”

• LSOCO

xx00x000

XIN “S”

HSOCO “S”

• LSOCO

xx00x110

XIN “S”

• HSOCO

LSOCO “S”

xx01x101

• XIN

HSOCO “O”

LSOCO “S”

xx10x001

XIN “O”

HSOCO “S”

• LSOCO

xx00x010

XIN “S”

HSOCO “O”

• LSOCO

xx00x100

• XIN

HSOCO “O”

LSOCO “O”

xx10x000

XIN “O”

• HSOCO

LSOCO “O”

xx01x000

• XIN

HSOCO “S”

LSOCO “O”

xx10x010

XIN “S”

• HSOCO

LSOCO “O”

xx01x100

XIN “O”

• HSOCO

LSOCO “S”

xx01x001

High-speed on-chip oscillator (HSOCO): oscillation start

b1=0

XIN oscillation:

oscillation start (Note 3)

b2=0

Low-speed on-chip oscillator

(LSOCO): oscillation start

b0=0

HSOCO

Oscillation

(b1=0)

Stop

(b1=1)

HSOCO

Oscillation

(b1=0)

Stop

(b1=1)

φSOURCE selection

XIN

(b5,4=1,0)

(Note 3)

LSOCO

(b5,4=0,0)

LSOCO

Stop

(b0=1)

Oscillation

(b0=0)

Oscillation

(b2=0)

Stop

(b2=1)

b5,4

(Note 3)

b1,0

(Note

b2,0 (Note 1)

b2,1

(Note

b2,0 (Note 1)

[Remarks]

Reset released

State transition of clock mode register CLKM (address: 003716) setting value and clock

(When XIN oscillation is used. The same applies when XCIN oscillation and external clock input are used.)

XIN “O”

HSOCO “S”

• LSOCO

xx00x010

b5,4

(Note 3)

(Note 2)

XIN, HSOCO, LSOCO, and respective oscillation and stop status in each mode are shown.

The symbol (

•) indicates φSOURCE (oscillation) selected by the clock selection bits.

“O” indicates oscillation and “S” indicates stopping.

The values such as “xx00x010” indicate the values (binary) of the clock mode register in the mode.

The arrow (bx) indicates a bit in the clock mode register, showing a transition by changing the bit values.

Entering the mode should be performed according to the arrows. Wait mode and stop mode can be

entered from all modes, and the original mode is returned after exiting.

Notes 1: When stopping the low-speed on-chip oscillator is disabled by the low-speed on-chip oscillator control bit (bit 4 in FSROM2),

“1” cannot be written to the bit 0 in CLKM. The low-speed on-chip oscillator does not stop even in stop mode.

2: After releasing reset, the low-speed on-chip oscillator is selected as

φSOURCE and divided by 8 is selected as the CPU clock.

3: When the oscillation pins not used is set by the oscillation method selection bits (bits 1 and 0 in FSROM1), “10” cannot be

written to bits 5 and 5 in CLKM. To use XIN oscillation as

φSOURCE, switch after XIN oscillation is stabilized. Supply a stable

clock when an external clock is used.

4: Do not change the values of the clock selection bits (bits 5 and 4) in CLKM and the individual clock oscillation control bits

(bits 2 to 0) at the same time using a singe instruction. Always use different instructions to rewrite these values.

5: Wait until the oscillation used in the destination mode is stabilized before entering.

Wait mode

• Low-speed on-chip oscillator: Status before executing WIT instruction is kept

• High-speed on-chip oscillator: Status before executing WIT instruction is kept

• XIN oscillation: Status before executing the WIT instruction is kept

Stop mode

• Low-speed on-chip oscillator: Stopped (Note 1)

• High-speed on-chip oscillator: Stopped

• XIN oscillation: Stopped

b5,4

(Note 3)

7549 Datasheet(PDF) 53 Page - Renesas Technology Corp

7549 Datasheet(HTML) 53 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

Datasheet Download

Link URL