General Description
The HT48RA1/HT48CA1 are 8-bit high performance, RISC architecture microcontroller devices specifically designed for multiple I/O control product applications. The data ROM can be used to store remote control codes. The mask version HT48CA1 is fully pin and functionally compatible with the OTP version HT48RA1 device.

FEATUREs
• Operating voltage: 2.0V~5.5V
• 23 bidirectional I/O lines (max.)
• 1 interrupt input shared with an I/O line
• 8-bit programmable timer/event counter with overflow interrupt and 8-stage prescaler (TMR0)
• 16-bit programmable timer/event counter and overflow interrupts (TMR1)
• On-chip crystal and RC oscillator
• Watchdog Timer
• 8Kx16 program memory
• 224x8 data memory RAM
• PFD supported
• HALT function and wake-up feature reduce power consumption
• 8-level subroutine nesting
• Up to 1μs instruction cycle with 4MHz system clock at VDD=3V
• Bit manipulation instruction
• 16-bit table read instruction
• 63 powerful instructions
• All instructions in one or two machine cycles
• Low voltage reset function
• 28-pin SOP/SSOP(209mil) package