4552 Datasheet, PDF(5/145 Page) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4552 Datasheet, PDF (5/145 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

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4552 Group

PIN DESCRIPTION

Name

VDD

Power supply

VSS

Ground

CNVSS

RESET

Reset input/output

XIN

XOUT

XCIN

XCOUT

D0âD5

D6, D7

Main clock input

Main clock output

Sub-clock input

Sub-clock output

I/O port D

Input is examined by

skip decision.

Output port D

P00âP03 I/O port P0

P10âP13 I/O port P1

P20âP23 I/O port P2

Port C

Output port C

COM0â

COM3

Common output

SEG0âSEG28 Segment output

(Note)

CNTR

Timer input/output

INT

Interrupt input

Input/Output

Function

Connected to a plus power supply.

Connected to a 0 V power supply.

Connect CNVSS to VSS and apply âLâ (0V) to CNVSS certainly.

I/O

An N-channel open-drain I/O pin for a system reset. When the SRST instruction,

watchdog timer, the built-in power-on reset or the voltage drop detection circuit

causes the system to be reset, the RESET pin outputs âLâ level.

Input

Output

I/O pins of the main clock generating circuit. When using a ceramic resonator, con-

nect it between pins XIN and XOUT. A feedback resistor is built-in between them.

When using the RC oscillation, connect a resistor and a capacitor to XIN, and leave

XOUT pin open.

Input

Output

I/O pins of the sub-clock generating circuit. Connect a 32.768 kHz quartz-crystal oscilla-

tor between pins XCIN and XCOUT. A feedback resistor is built-in between them. XCIN and

XCOUT pins are also used as ports D6 and D7, respectively.

I/O

Each pin of port D has an independent 1-bit wide I/O function. The output structure

can be switched to N-channel open-drain or CMOS by software. For input use, set

the latch of the specified bit to â1â and select the N-channel open-drain. Port D5 is

also used as INT pin.

Output

Each pin of port D has an independent 1-bit wide output function. The output struc-

ture is N-channel open-drain. Ports D6 and D7 are also used as XCIN pin and XCOUT

pin, respectively.

I/O

Port P0 serves as a 4-bit I/O port. The output structure can be switched to N-channel

open-drain or CMOS by software. For input use, set the latch of the specified bit to

â1â and select the N-channel open-drain. Port P0 has a key-on wakeup function and

a pull-up function. Both functions can be switched by software. Ports P00âP03 are

also used as SEG21âSEG24, respectively.

I/O

Port P1 serves as a 4-bit I/O port. The output structure can be switched to N-channel

open-drain or CMOS by software. For input use, set the latch of the specified bit to

â1â and select the N-channel open-drain. Port P1 has a key-on wakeup function and

a pull-up function. Both functions can be switched by software. Ports P10âP13 are

also used as SEG25âSEG28, respectively.

I/O

Port P2 serves as a 4-bit I/O port. The output structure can be switched to N-channel

open-drain or CMOS by software. For input use, set the latch of the specified bit to

â1â and select the N-channel open-drain.

Ports P20âP23 are also used as SEG17âSEG20, respectively.

Output 1-bit output port. The output structure is CMOS. Port C is also used as CNTR pin.

Output LCD common output pins. Pins COM0 and COM1 are used at 1/2 duty, pins COM0â

COM2 are used at 1/3 duty and pins COM0âCOM3 are used at 1/4 duty.

Output

LCD segment output pins. SEG0âSEG2 pins are used as VLC3âVLC1 pins, respec-

tively. SEG17âSEG28 pins are used as Ports P20âP23, Ports P00âP03 and Ports

P10âP13, respectively.

I/O

CNTR pin has the function to input the clock for the timer 1 event counter and to out-

put the PWM signal generated by timer 2.CNTR pin is also used as Port C.

Input

INT pin accepts external interrupts. They have the key-on wakeup function which can

be switched by software. INT pin is also used as Port D5.

Note: SEG13 pin is not existed in the 4552 Group.

MULTIFUNCTION

Multifunction

XCIN

P20

SEG17

XCOUT

P21

SEG18

P00

SEG21

SEG21 P00

P22

SEG19

P01

SEG22

SEG22 P01

P23

SEG20

P02

SEG23

SEG23 P02

INT

P03

SEG24

SEG24 P03

CNTR

P10

SEG25

SEG25 P10

SEG0

VLC3

P11

SEG26

SEG26 P11

SEG1

VLC2

P12

SEG27

SEG27 P12

SEG2

VLC1

P13

SEG28

SEG28 P13

Notes 1: Pins except above have just single function.

2: The input/output of D5 can be used even when INT is selected.

The threshold value is different between port D5 and INT. Accordingly, be careful when the input of both is used.

3: The port C âHâ output function can be used even when CNTR (output) is selected.

Multifunction

P20

P21

P22

P23

SEG0

SEG1

SEG2

Rev.3.02 Dec 22, 2006 page 5 of 142

REJ03B0023-0302

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