General Description
The HT46R53/HT46R54 are 8-bit high performance, RISC architecture microcontroller devices specifically designed for A/D applications that interface directly to analog signals, such as those from sensors. The advan tages of low power consumption, I/O flexibility, timer functions, oscillator options, multi-channel A/D converter, Pulse Width Modulation function, HALT and wake-up functions, watchdog timer, as well as low cost, enhance the versatility of these devices to suit a wide range of A/D application possibilities such as sensor signal processing, chargers, motor driving, industrial control, consumer products, subsystem controllers, etc.

FEATUREs
 Low-power fully static CMOS design
 Operating voltage:
   fSYS=4MHz: 2.2V~5.5V
   fSYS=8MHz: 3.3V~5.5V
 Program Memory:
   2K x 14 OTP (HT46R53)
   4K x 15 OTP (HT46R54)
 Data memory: 88 x 8 RAM
 A/D converter: 12bits x 8Ch
   External A/D converter reference voltage input pin
 22 bidirectional I/O lines
 1 interrupt input shared with an I/O line
 8-bit programmable timer/event counter with over flow interrupt and 7-stage prescaler
 On-chip crystal and RC oscillator
 6-level subroutine nesting
 Watchdog Timer
 Low voltage reset function
 HALT function
 Up to 0.5us instruction cycle with 8MHz system clock at VDD=5V
 1-channel 8-bit PWM output shared with an I/O line
 PFD function
 Bit manipulation instruction
 Table read instruction
 63 powerful instructions
 All instructions in one or two machine cycles
 28-pin SKDIP/SOP package