General Description
The HT48R05A-1/HT48C05 and HT48R06A-1/HT48C06 are 8-bit high performance, RISC architecture microcontroller devices specifically designed for cost-effective multiple I/O control product applications. The mask version HT48C05 and HT48C06 are fully pin and functionally compatible with the OTP version HT48R05A-1 and HT48R06A-1 devices.

Features
• Operating voltage:
   fSYS=4MHz: 2.2V~5.5V
   fSYS=8MHz: 3.3V~5.5V
• 13 bidirectional I/O lines
• An interrupt input shared with an I/O line
• 8-bit programmable timer/event counter with over-flow interrupt and 8-stage prescaler
• On-chip crystal and RC oscillator
• Watchdog Timer
• Program memory ROM:
   512x14 for HT48R05A-1/HT48C05
   1024x14 for HT48R06A-1/HT48C06
• Data memory RAM
   328 for HT48R05A-1/HT48C05
   648 for HT48R06A-1/HT48C06
• Buzzer driving pair and PFD supported
• HALT function and wake-up feature reduce power consumption
• Up to 0.5μs instruction cycle with 8MHz system clock at VDD=5V
• All instructions in one or two machine cycles
• 14-bit table read instruction
• Two-level subroutine nesting
• Bit manipulation instruction
• Powerful instructions:
   62 for HT48R05A-1/HT48C05
   63 for HT48R06A-1/HT48C06
• Low voltage reset function
• 16-pin SSOP package
   18-pin DIP/SOP package