4502 datasheet(18/214 Pages) RENESAS

18 / 214 page

1-6

Rev.2.01

Feb 02, 2005

4502 Group

HARDWARE

REJ09B0193-0201

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.

• External ceramic resonator

• External RC oscillation

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

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

oscillator.]

q System clock

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

The system clock is selected by the bits 2 and 3 of the clock con-

trol register MR.

System clock

(Note 1)

f(XIN) or f(RING)

f(XIN)/2 or f(RING)/2

f(XIN)/4 or f(RING)/4

f(XIN)/8 or f(RING)/8

Table Selection of system clock

Notes 1: The on-chip oscillator clock is f(RING), the clock by the

ceramic resonator, RC oscillation or external clock is

f(XIN).

2: The default mode is selected after system is released

from reset and is returned from RAM back-up.

MR2

MR3

Operation mode

High-speed mode

Middle-speed mode

Low-speed mode

Default mode

q 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.

q Machine cycle

The machine cycle is the standard cycle required to execute the

instruction.

PORT FUNCTION

Port

Port D

Port P0

Port P1

Port P2

Port P3

I/O

unit

Control

instructions

SD, RD

SZD, CLD

SCP, RCP

SNZCP

IAK, OKA

OP0A

IAP0

OP1A

IAP1

OP2A

IAP2

OP3A

IAP3

Control

registers

PU2, K2

PU0, K0

PU1, K1

W6, I1

PU2, K2

Output structure

N-channel open-drain

Input

Output

I/O

(6)

I/O

(4)

I/O

(4)

I/O

(2)

I/O

(2)

Remark

D0, D1, D4, D5

D2/C

D3/K

P00–P03

P10, P11

P12/CNTR,

P13/INT

P20/AIN0

P21/AIN1

P30/AIN2

P31/AIN3

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

PIN DESCRIPTION

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