DESCRIPTION

The 4282 Group enables fabrication of 8 × 7 key matrix and has the followin timers;

? an 8-bit timer which can be used to set each carrier wave and has two reload register

? an 8-bit timer which can be used to auto-control and has a reload register.

FEATURES

? Number of basic instructions ............................................. 68

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

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

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

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

? Timer

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

(This has a reload register and carrier wave output auto-control

function)

Timer 2 ................................................................... 8-bit timer

(This has two reload registers and carrier wave output function)

? Logic operation function (XOR, OR, AND)

? RAM back-up function

? Key-on wakeup function (ports D4–D7, E0–E2, G0–G3) .... 11

? 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

(system reset)

APPLICATION

Various remote control transmitters