4518 datasheet(6/160 Pages) RENESAS

6 / 160 page

Rev.3.01

2005.06.15

page 6 of 157

REJ03B0008-0301

4518 Group

DEFINITION OF CLOCK AND CYCLE

q Operation source clock

The operation source clock is the source clock to operate this

product. In this product, the following clocks are used.

• Clock (f(XIN)) by the external ceramic resonator

• Clock (f(XIN)) by the external RC oscillation

• Clock (f(XIN)) by the external input

• Clock (f(RING)) of the on-chip oscillator which is the internal

oscillator

• Clock (f(XIN)) by the external quartz-crystal oscillation

System clock

f(STCK) = f(XIN)

f(STCK) = f(RING)

f(STCK) = f(XIN)/2

f(STCK) = f(RING)/2

f(STCK) = f(XIN)/4

f(STCK) = f(RING)/4

f(STCK) = f(XIN)/8

f(STCK) = f(RING)/8

Table Selection of system clock

✕: 0 or 1

Note: The f(RING)/8 is selected after system is released from reset.

When on-chip oscillator clock is selected for main clock, set

the on-chip oscillator to be operating state.

MR2

MR3

Operation mode

XIN through mode

Ring through mode

XIN divided by 2 mode

Ring divided by 2 mode

XIN divided by 4 mode

Ring divided by 4 mode

XIN divided by 8 mode

Ring divided by 8 mode

q System clock (STCK)

The system clock is the basic clock for controlling this product.

The system clock is selected by the clock control register MR

shown as the table below.

q Instruction clock (INSTCK)

The instruction clock is the basic clock for controlling CPU. The

instruction clock (INSTCK) is a signal derived by dividing the

system clock (STCK) by 3. The one instruction clock cycle gen-

erates the one machine cycle.

q Machine cycle

The machine cycle is the standard cycle required to execute the

instruction.

MR0

MR1

Notes 1: Pins except above have just single function.

2: The input/output of P30 and P31 can be used even when INT0 and INT1 are selected.

3: The input of ports P20–P22 can be used even when SIN, SOUT and SCK are selected.

4: The input/output of D6 can be used even when CNTR0 (input) is selected.

5: The input of D6 can be used even when CNTR0 (output) is selected.

6: The input/output of D7 can be used even when CNTR1 (input) is selected.

7: The input of D7 can be used even when CNTR1 (output) is selected.

P20

P21

P22

P30

P31

Multifunction

CNTR0

CNTR1

SCK

SOUT

SIN

INT0

INT1

MULTIFUNCTION

CNTR0

CNTR1

SCK

SOUT

SIN

INT0

INT1

Multifunction

P20

P21

P22

P30

P31

P60

P61

P62

P63

Multifunction

AIN0

AIN1

AIN2

AIN3

AIN0

AIN1

AIN2

AIN3

Multifunction

P60

P61

P62

P63

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