General Description
The HT49RA1/HT49CA1 is a Remote Type 8-bit MCU 8-bit high performance RISC architecture microcontroller. With its internal carrier generator and LCD Driver functions the device is is especially suitable for multiple I/O remote control product applications. The usual Holtek MCU features such as power down and wake-up functions, oscillator options, etc. combine to ensure user applications require a minimum of external components.

FEATUREs
• Operating voltage: 2.0V~3.6V
• 12 bidirectional I/O lines, 8 input lines, 8 segment output, PC0 (input/output)/REM
• Two external interrupt inputs shared with an I/O line
• 8-bit programmable Timer/Event Counter with overflow interrupt function
• Single 16-bit programmable timer/event counter with overflow interrupt function
• RC oscillator and 32768Hz crystal oscillator
• LCD driver with 33x2, 33x3 or 32x4 segments (C type only), 8 logical output option for SEG12~SEG19 and 4 I/O port option for SEG0~SEG3 by changing LCDC register
• 4096x15 program memory
• 160x8 data memory
• Real Time Clock - RTC
• 8-bit prescaler for RTC
• One carrier output (1/2 or 1/3 duty)
• Software LCD, RTC control
• Watchdog Timer function
• Power down and wake-up functions to reduce power consumption
• Up to 1μs instruction cycle with 4MHz system clock
• 4-level subroutine nesting
• Bit manipulation instruction
• Table read instructions
• 63 powerful instructions
• All instructions executed in one or two machine cycles
• Low voltage reset/detector function
• 64-pin LQFP package