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