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