General Description
The device are 8-bit, high performance, RISC architecture microcontroller devices specifically designed for A/D applications that interface directly to analog signals, such as those from sensors.

FEATUREs
Operating voltage:
  fSYS=4MHz: 2.2V~5.5V
  fSYS=8MHz: 3.3V~5.5V
20 bidirectional I/O lines
Two interrupt input shared with an I/O line
Two 8-bit programmable timer/event counter with overflow interrupt and 7-stage prescaler
Two 8-bit programmable pulse generator (PPG) output channels, with prescaler and 8-bit programmable
timer counter, and supports active low or active high output
On-chip crystal and RC oscillator
Watchdog Timer
409615 program memory
1928 data memory RAM
Supports PFD for sound generation
HALT function and wake-up feature reduce power consumption
Up to 0.5s instruction cycle with 8MHz system clock at VDD=5V
8-level subroutine nesting
8 channels 9-bit resolution A/D converter
Two comparators with interrupt function
Bit manipulation instruction
15-bit table read instruction
63 powerful instructions
All instructions in one or two machine cycles
Low voltage reset function
28-pin SKDIP/SOP package