M34570M4-302FP
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
DESCRIPTION
The 4570 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 a carrier wave output circuit for remote control, an 8-bit timer
with a reload register, a 10-bit timer with a reload register, and
an 8-bit timer with two reload registers.
The various microcomputers in the 4570 Group include variations
of the built-in memory size. The mask ROM version and One
Time PROM version of 4570 Group are produced as shown in
the table below.
FEATURES
Minimum instruction execution time
When f(XIN) is selected for system clock .......................1.5µs
(f(XIN)=2.0 MHz, VDD=4.5 V to 5.5 V)
When f(XIN)/4 is selected for system clock ................. 2.86µs
(f(XIN)=4.2 MHz, VDD=2.0 V to 5.5 V)
Supply voltage
............................. 2.5 V to 5.5 V (One Time PROM version)
....................................... 2.0 V to 5.5 V (Mask ROM version)
System clock switch function
............................................................. f(XIN)/4 or not divided
Timers
Timer 1... 10-bit timer with a reload register and carrier wave
output auto-controfunction
Timer 2 ................................ 8-bit timer with a reload register
Timer 3... 8-bit timer with two reload registers and carrier wave
generation function
Interrupt ................................................................... 4 sources
Power-on reset circuit
Watchdog timer ............................................................ 16 bits
Key-on wakeup function (Ports P0, P1, and P4, ON/OFF of
port P4 can be switched)
lPull-up transistor .............. (Ports P0, P1, and P4, ON/OFF of
port P4 can be switched)
Voltage drop detection circuit
Clock generating circuit (ceramic resonance)
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