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Rev.1.02
Nov 26, 2008
REJ03B0224-0102
DESCRIPTION
The 455A Group is a 4-bit single-chip microcomputer designed
with CMOS technology. Its CPU is that of the 4500 Series using
a simple, high-speed instruction set. The computer is equipped
with two 8-bit timers (each timer has one or two reload registers),
a 16-bit timer for clock count, interrupts, and oscillation circuit
switch function.
The various microcomputers in the 455A Group include
variations of type as shown in the table below.
FEATURES
Minimum instruction execution time..............................0.5
s
(at 6 MHz oscillation frequency, in high-speed through-mode)
Supply voltage .......................................................1.8 to 5.5 V
(It depends on operation source clock, oscillation frequency
and operation mode)
Timers
Timer 1 ..............................................................8-bit timer with
a reload register and carrier wave output auto-control function
Timer 2 ............................. 8-bit timer with two reload registers
and carrier wave generation circuit
Timer 3 ........................ 16-bit timer (fixed dividing frequency)
Interrupt ..................................................................... 4 sources
Key-on wakeup function pins .............................................. 24
I/O ports ............................................................................... 24
Output ports ........................................................................... 1
LCD control circuit
Segment output ..................................................................... 32
Common output ...................................................................... 4
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
Watchdog timer
Clock generating circuit
Built-in clock (high-speed/low-speed on-chip oscillator)
Main clock (ceramic resonator)
Sub-clock (quartz-crystal oscillation)
LED drive directly enabled (port D)
APPLICATION
Remote control transmitter
Note1.Shipped in blank
Table 1
Support Product
Part number
ROM size (
× 10 bits)
RAM size (
× 4 bits)
Package
ROM type
8192 words
512 words
PLQP0052JA-A
QzROM
M3455AG8-XXXFP
12288 words
M3455AGC-XXXFP
455A Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
REJ03B0224-0102
Rev.1.02
Nov 26, 2008