4559 datasheet(5/148 Pages) RENESAS

5 / 148 page

Rev.1.04

Aug 23, 2007

Page 5 of 146

REJ03B0188-0104

4559 Group

PIN DESCRIPTION

Table 3

Pin description

Name

Input/Output

Function

VDD

Power source

−

Connected to a plus power supply.

VSS

Power source

−

Connected to a 0 V power supply.

CNVSS

−

This pin is shared with the VPP pin which is the power source input pin for

programming the built-in QzROM. Connect to VSS through a resistor about 5 k

Ω.

VDCE

Voltage drop

detection circuit

enable

Input

This pin is used to operate/stop the voltage drop detection circuit.

When “H“ level is input to this pin, the circuit starts operating.

When “L“ level is input to this pin, the circuit stops operating.

XIN

Main clock input

Input

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

connect 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.

XOUT

Main clock output

Output

XCIN

Sub clock input

Input

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

oscillator 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.

XCOUT

Sub clock output

Output

RESET

Reset I/O

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 “L” level.

−D5

I/O port D

(Input is examined

by skip decision.)

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 “1” and select the N-channel open-drain.

Port D5 is also used as INT pin.

D6, D7

Output port D

Output

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

structure is N-channel open-drain.

Ports D6 and D7 are also used as XCIN pin and XCOUT pin, respectively.

P00

−P03

I/O port P0

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

“1” 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 P00–P03 are also used as SEG16–SEG19, respectively.

P10

−P13

I/O port P1

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

“1” 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 P10–P13 are also used as SEG20–SEG23, respectively.

P20

−P23

I/O port P2

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

“1” and select the N-channel open-drain. Port P2 has a key-on wakeup function and

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

Ports P20–P23 are also used as SEG24–SEG27, respectively.

P30

−P33

I/O port P3

I/O

Port P3 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

“1” and select the N-channel open-drain. Port P3 has a key-on wakeup function and

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

Ports P30–P33 are also used as SEG28–SEG31, respectively.

Output port C

Output

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

COM0

−COM3 Common output

Output

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

COM2 are used at 1/3 duty and pins COM0–COM3 are used at 1/4 duty.

SEG0

−SEG31 Segment output

Output

LCD segment output pins.

SEG0–SEG2 pins are used as VLC3–VLC1 pins, respectively.

SEG16–SEG31 pins are used as Ports P00–P03, Ports P10–P13, Ports P20–P23, and

Ports P30–P33, respectively.

CNTR

Timer I/O

I/O

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

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

INT

Interrupt input

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.

VLC3

−VLC1

LCD power source

−

These are the LCD power supply pins. If an internal resistor is used, connect the

VLC3 pin to the VDD pin. (If brightness adjustment is required, connect via a resistor.)

When using an external power supply, apply voltage such that VSS

≤ VLC1 ≤ VLC2 ≤

VLC3

≤ VDD. Pins VLC3 to VLC1 also function as pins SEG0 to SEG2.

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