General Description
The HT48R30A-1/HT48C30-1 are 8-bit high performance, RISC architecture microcontroller devices specifically designed for multiple I/O control product applications. The mask version HT48C30-1 is fully pin and functionally compatible with the OTP version HT48R30A-1 device.

FEATUREs
Operating voltage:
  fSYS=4MHz: 2.2V~5.5V
  fSYS=8MHz: 3.3V~5.5V
Low voltage reset function
25 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
On-chip RC oscillator, external crystal and RC oscillator
32768Hz crystal oscillator for timing purposes only
Watchdog Timer
204814 program memory ROM
968 data memory RAM
Buzzer driving pair and PFD supported
HALT function and wake-up feature reduce power consumption
4-level subroutine nesting
Up to 0.5s instruction cycle with 8MHz system clock at VDD=5V
Bit manipulation instruction
14-bit table read instruction
63 powerful instructions
All instructions in one or two machine cycles
24/28-pin SKDIP/SOP package