General Description
The HT46R51/HT46R52 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:
  1K14 OTP (HT46R51)
  2K14 OTP (HT46R52)
Data memory: 888 RAM
A/D converter: 12bits x 5Ch
  External A/D converter reference voltage input pin
14 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 0.5s 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
18-pin DIP, 20-pin SOP/SSOP package