4571 datasheet(6/126 Pages) RENESAS

6 / 126 page

Rev.1.02

May 25, 2007

Page 6 of 124

REJ03B0179-0102

4571 Group

PORT FUNCTION

DEFINITION OF CLOCK AND CYCLE

• 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 input

• System clock

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

The system clock is selected by the register MR.

• Instruction clock

The instruction clock is a signal derived by dividing the system

clock by 3. The one instruction clock cycle generates the one

machine cycle.

• Machine cycle

The machine cycle is the standard cycle required to execute the

instruction.

Note 1.The frequency divided by 8 is selected after system is

released from reset.

Table 5

Port function

Port

Input

Output

structure

I/O unit

Control

instructions

Control

registers

Remark

Port D

−D3

I/O

(5)

N-channel

open-drain/

CMOS

1 bit

SD, RD

SZD, CLD

FR1

Programmable output

structure selection function

D4/CNTR0

N-channel

open-drain

−

Port P0

P00

P01

P02

P03

I/O

(4)

N-channel

open-drain

4 bits

OP0A

IAP0

PU0

Programmable pull-up and

key-on wakeup function

Port P1

P10

P11

P12

P13

I/O

(4)

N-channel

open-drain

4 bits

OP1A

IAP1

PU1

Programmable pull-up and

key-on wakeup function

Port P2

P20/INT0

P21/INT1

I/O

(2)

N-channel

open-drain

2 bits

OP2A

IAP2

PU2

K2, I1, I2, L1

Programmable pull-up and

key-on wakeup function

Port P3

P30

P31

I/O

(2)

N-channel

open-drain/

CMOS

2 bits

OP3A

IAP3

FR0

Programmable output

structure selection function

Port C

C/CNTR1

Output

(1)

CMOS

1 bit

RCP

SCP

W1, W3, W5

−

Port K

Input

(1)

1 bit

IAK

Programmable key-on

wakeup function

Table 6

Table Selection of system clock

System clock

Operation mode

MR3

MR2

f(STCK) = f(XIN)/8

Frequency divided by 8 mode

f(STCK) = f(XIN)/4

Frequency divided by 4 mode

f(STCK) = f(XIN)/2

Frequency divided by 2 mode

f(STCK) = f(XIN)

Frequency through mode

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