General Description
The HT46R232/HT46C232 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 mask
version HT46C232 is fully pin and functionally compatible with the OTP version HT46R232 device.

FEATUREs
Operating voltage:
  fSYS=4MHz: 2.2V~5.5V
  fSYS=8MHz: 3.3V~5.5V
40 bidirectional I/O lines (max.)
1 interrupt input shared with an I/O line
Two 16-bit programmable timer/event counter with overflow interrupt
On-chip crystal and RC oscillator
Watchdog Timer
409616 program memory
1928 data memory RAM
Supports PFD for sound generation
HALT function and wake-up feature reduce power consumption
Up to 0.5s instruction cycle with 8MHz system clock at VDD=5V
8-level subroutine nesting
8 channels 10-bit resolution A/D converter
4-channel 8-bit PWM output shared with four I/O lines
Bit manipulation instruction
16-bit table read instruction
63 powerful instructions
All instructions in one or two machine cycles
Low voltage reset function
I2C Bus (slave mode)
28-pin SKDIP/SOP, 48-pin SSOP packages