General Description

This device is an 8-bit high performance RISC architecture microcontroller designed for USB product applications. It is particularly suitable for use in products such as keyboards and keyboard with calculator. A HALT feature is included to reduce power consumption.

Features

? Operating voltage: fSYS=6M/12MHz: 2.2V~5.5V

? 40 bidirectional I/O lines (max.)

? 8-bit programmable timer/event counter with overflow interrupt (shared with PD4, vector 08H)

? 16-bit programmable timer/event counter and overflow interrupts (shared with PA7, vector 0CH)

? Crystal oscillator (6MHz or 12MHz)

? Watchdog Timer

? PS2 and USB modes supported

? USB 2.0 low speed function

? 4 endpoints supported (endpoint 0 included)

? 614416 program memory ROM

? 2248 data memory RAM

? One internal USB interrupt (vector 04H)

? All I/O ports support wake-up options

? HALT function and wake-up feature reduce power consumption

? 8-level subroutine nesting

? Up to 0.33s instruction cycle with 12MHz system clock at VDD=5V

? Bit manipulation instruction

? 16-bit table read instruction

? 63 powerful instructions

? All instructions in one or two machine cycles

? Optional 3-battery mode 2.4V LVR/2.6V LVD (0.1V) by option, Low battery detector with internal bit

? Optional 2-battery mode 2.2V LVR/2.4V LVD (0.1V) by option, Low battery detector with internal bit

? Operating voltage from 4.0V to 5.5V (For Connect USB/PS2 Mode)

? Operating voltage from 2.2V to 3.3V (For Pure Cal. Mode)

? 48-pin SSOP package