General Description
The HT45F23A is a Flash Memory Tinypower A/D type 8-bit high performance RISC architecture
microcontrollers, designed especially for applications that interface directly to analog signals.
The HT45F23A device has a higher gain bandwidth making it more suitable for higher frequency
applications.

FEATUREs
CPU Features
•  Operating voltage:
– fSYS= 32.768kHz: 2.2V~5.5V
– fSYS= 910kHz: 2.2V~5.5V
– fSYS= 2MHz: 2.2V~5.5V
– fSYS= 4MHz: 2.2V~5.5V
– fSYS= 8MHz: 3.3V~5.5V
•  TinyPower technology for low power operation
•  Power down and wake-up functions to reduce power consumption
•  Oscillator types:
– External Crystal - HXT
– External 32.768kHz Crystal - LXT
– External RC - ERC
– Internal RC - HIRC
– Internal 32kHz RC - LIRC
•  Multi-mode operation: Normal, Slow, Idle and Sleep
•  Fully integrated internal 32kHz, 910kHz, 2MHz, 4MHz and 8MHz oscillator requires no external components
•  Externally supplied system clock option
•  All instructions executed in one or two machine Cycles
•  Table read instructions
•  61 or 63 powerful instructions
•  6-level subroutine nesting
•  Bit manipulation instruction

Peripheral Features
•  Flash Program Memory: 2K×15
•  RAM Data Memory: 128×8
•  EEPROM Data Memory: 64×8
•  Watchdog Timer function
•  Up to 22 bidirectional I/O lines
•  Software controlled 4-SCOM lines LCD COM driver with 1/2 bias
•  Multiple pin-shared external interrupts
•  Single 8-bit programmable Timer/Event Counter with overflow interrupt and Single 16-bit programmable Timer/Event Counter with overflow interrupt function
•  Dual Time-Base functions
•  Serial Interfaces Module - SIM for SPI or I2C
•  Dual Comparator functions
•  Dual Operational Amplifiers functions
•  Operational Amplifier output to internal two channel 12-bit ADC function
•  Up to 6 channel 12-bit ADC
•  Up to 2 channel 8-bit PWM
•  12-bit Audio DAC output
•  PFD/Buzzer for audio frequency generation
•  Internal 2.4V/3.3V LDO
•  Low voltage reset function
•  Low voltage detect function
•  16-pin NSOP, 20/24-pin SSOP package types