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-control function

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)

● Pull-up transistor .............. (Ports P0, P1, and P4, ON/OFF of

port P4 can be switched)

● Voltage drop detection circuit

● Clock generating circuit (ceramic resonance)

APPLICATION

Remote control transmitter