Here is a microcontroller chip specification:

Up to 18 bidirectional I/O lines
One interrupt input
One 8-bit programmable Timer/event counter with overflow interrupt
On-chip crystal and RC oscillator
Watch dog timer
1K x 14 program ROM
64 x 8 data RAM
OTP parts available
Operating voltage: 2.4 - 5.2V
Halt function to reduce power consumption and wake-up feature
1 microsecond instruction cycle with 4MHz system clock at VDD=5V
All instructions in 1 or 2 machine cycles
14-bit table read instructions
Two-level subroutine nesting

Recognise it?

It's the HT48100 8-bit Microcontroller from HOLTEK.

Details are at http://www.holtek.com

Download 48100.PDF to see the details


John Blackburn,
London UK.