DESCRIPTION

The 4280 Group is a 4-bit single-chip microcomputer designed with CMOS technology for remote control transmitters. The 4280 Group has 7 carrier waves and enables fabrication of 8 × 7 key matrix.

FEATURES

? Number of basic instructions ............................................. 62

? Minimum instruction execution time ............................ 8.0 μs

(at f(XIN) = 4.0 MHz, system clock = f(XIN)/8, VDD=3.0 V)

? Supply voltage ................................................. 1.8 V to 3.6 V

? Subroutine nesting ..................................................... 4 levels

? Timer

Timer 1 ................................................................... 8-bit timer

with a reload register and carrier wave output auto-control

function

? Carrier wave output function (port CARR)

f(XIN), f(XIN)/4, f(XIN)/8, f(XIN)/12

f(XIN)/64, f(XIN)/96, “H” output fixed

? Logic operation function (XOR, OR, AND)

? RAM back-up function

? Key-on wakeup function (ports D7, E0–E2, G0–G3) ............. 8

? I/O port (ports D, E, G, CARR) .......................................... 16

? Oscillation circuit ..................................... Ceramic resonance

? Watchdog timer

? Power-on reset circuit

? Voltage drop detection circuit ......................... Typical:1.50 V

APPLICATION

Various remote control transmitters