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