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. The mask version HT82K94A is fully pin and functionally compatible with the OTP version HT82K94E device. HT82K94A under development, available in 2Q, 2006.

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
• USB1.1 low speed function
• 4 endpoints supported (endpoint 0 included)
• 614416 program memory ROM
• 2248 data memory RAM
• One external interrupt input (shared with PA4 vector 04H)
• 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)
• 40-pin DIP, 48-pin SSOP package