455A datasheet(4/148 Pages) RENESAS

4 / 148 page

Rev.1.01

Feb 15, 2008

Page 4 of 146

REJ03B0224-0101

455A Group

PERFORMANCE OVERVIEW

Table 2

Performance overview

Parameter

Function

Number of basic instructions

138

Minimum instruction execution time

0.5

µs (Oscillation frequency 6 MHz: high-speed through mode)

Memory sizes

ROM

M3455AG8

8192 words

× 10 bits

M3455AGC

12288 words

× 10 bits

RAM

512 words

× 4 bits (including LCD display RAM 32 words × 4 bits)

I/O port

−D5

I/O

(Input is

examined by

skip decision.)

Six independent I/O ports. A pull-up function, a key-on wakeup function and output

structure can be switched by software.

Port D5 is also used as INT pin.

, D7

I/O

(Input is

examined by

skip decision.)

Two independent I/O ports; each pin is equipped with a pull-up function and a key-on

wakeup function. Both functions can be switched by software.

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

P00

−P03

I/O

4-bit I/O port; A pull-up function, a key-on wakeup function and output structure can

be switched by software.

Ports P00

−P03 are also used as SEG16−SEG19, respectively.

P10

−P13

I/O

4-bit I/O port; A pull-up function, a key-on wakeup function and output structure can

be switched by software.

Ports P10

−P13 are also used as SEG20−SEG23, respectively.

P20

−P23

I/O

4-bit I/O port; A pull-up function, a key-on wakeup function and output structure can

be switched by software.

Ports P20

−P23 are also used as SEG24−SEG27, respectively.

P30

−P33

I/O

4-bit I/O port; A pull-up function, a key-on wakeup function and output structure can

be switched by software.

Ports P30

−P33 are also used as SEG28−SEG31, respectively.

Output

1-bit output; Port C is also used as CNTR pin.

Timer

Timer 1

8-bit timer with a reload register and carrier wave output auto-control function, and

has an event counter.

Timer 2

8-bit timer with two reload registers and carrier wave generation function.

Timer 3

16-bit timer, fixed dividing frequency (timer for clock count)

Timer LC

4-bit programmable timer with a reload register (for LCD clock generating)

Watchdog timer

16-bit timer, fixed dividing frequency (timer for monitor)

LCD control circuit

Selective bias value

1/2, 1/3 bias

Selective duty value

2, 3, 4 duty

Common output

Segment output

Internal resistor for power

supply

× 3, 2r × 2, r × 3, r × 2 (r = 100 kΩ, (Ta = 25 °C, Typical value))

Voltage drop

detection circuit

Reset occurrence

Typ. 1.7 V (Ta=25 °C)

Reset release

Typ. 1.8 V (Ta=25 °C)

Skip occurrence

Typ. 2.0 V (Ta=25 °C)

Power-on reset circuit

Built-in

Interrupt

Source

4 sources (one for external, three for timers)

Nesting

1 level

Subroutine nesting

8 levels

Device structure

CMOS silicon gate

Package

52-pin plastic molded LQFP (PLQP0052JA-A)

Operating temperature range

-20 to 85 °C

Power source voltage

1.8 to 5.5 V (It depends on operation source clock, oscillation frequency and

operation mode)

Power

dissipation

(Typ. value)

At active mode

0.3 mA (Ta = 25 °C, VDD

= 3.0 V, f(XIN) = 4 MHz, f(XCIN) = stop, f(HSOCO) = stop,

f(LSOCO)=stop, f(STCK) = f(XIN/8)

At clock operating mode

µA (Ta = 25 °C, VDD = 3.0 V, f(XCIN) = 32 kHz)

At RAM back-up

0.1

µA (Ta = 25 °C, output transistor is cut-off state)

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