The HT48R06A-1 is a low-cost, high-performance 8-bit OTP (One-Time Programmable) RISC microcontroller from Holtek, designed mainly for embedded control applications requiring multiple digital I/O lines, timers, interrupts, watchdog protection, and low-power operation.

Technical Specifications

Parameter	Specification
Part Number	HT48R06A-1
Manufacturer	Holtek Semiconductor
MCU Type	8-bit RISC microcontroller
Program Memory	1K × 14-bit
Data RAM	64 × 8-bit
I/O Pins	13 bidirectional I/O lines
Timer	1 × 8-bit programmable timer/event counter
Prescaler	8-stage
Interrupts	2 interrupt sources
Operating Voltage	2.2–5.5 V at 4 MHz; 3.3–5.5 V at 8 MHz
Oscillator	Crystal or RC oscillator
Watchdog	Built-in Watchdog Timer
Instruction Cycle	Up to 0.5 µs at 8 MHz / 5 V
Low-Power Mode	HALT with wake-up
Reset	Low-voltage reset
Package	16-pin SSOP/NSOP or 18-pin SOP; package availability depends on version
Programming	OTP — programmable once

The current Holtek documentation lists the HT48R06A-1 with 1K×14 program memory, 64×8 RAM, 13 I/O lines, one 8-bit timer and two interrupt sources.

Key Features

8-bit RISC architecture for simple embedded-control applications.
13 programmable bidirectional I/O pins for switches, LEDs, sensors, relays and other peripherals.
Built-in 8-bit timer/event counter with an 8-stage prescaler.
Watchdog Timer (WDT) helps recover the MCU from software lockups.
Supports both crystal and RC oscillator configurations.
HALT and wake-up functions help reduce power consumption.
Built-in low-voltage reset function.
Supports a buzzer-driving pair and PFD (programmable frequency divider).
14-bit table-read capability and bit-manipulation instructions.

Typical Applications

The HT48R06A-1 is suitable for:

Remote controls
Fan and light controllers
Washing-machine controllers
Electronic scales
Toys and small consumer electronics
Keypad/button controllers
LED control systems
Simple alarm systems
Timers and counters
Industrial control panels
Appliance control boards
General-purpose embedded control

Holtek HT48R06A-1 – 8-Bit OTP Microcontroller