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