HT48RA0-3/ HT48CA0-3 is an 8-bit high-performance reduced instruction set microcontroller designed for multi-input/output products. HT48RA0-3 is an upgraded version of HT48RA0-2, which introduces an internal RC oscillator that can operate normally in the 2.0V ~3.6V operating voltage range.
The HT48RA0-3 (OTP version) and HT48CA0-3 (mask‑programmed version) are eight‑bit RISC microcontrollers designed for applications requiring many I/O ports. They feature low power consumption, stable I/O, a built‑in RC oscillator, watchdog timer, halt and wake‑up functions, and are offered in a 20‑pin SSOP package.
Key specifications include a 2.0 V‑3.6 V operating voltage range, a 4 MHz system clock (±3%), 1 KB ×14‑bit program memory, 32 ×8‑bit data RAM, and 10 bidirectional I/O pins with optional Schmitt‑trigger inputs. The device also provides a carrier output, built‑in reset circuitry, and various mask‑configurable features. This manual is written in Chinese.
| Operating voltage (VDD) | 2.0 V – 3.6 V |
|---|---|
| System clock frequency | 4 MHz ±3% |
| Program memory size | 1 KB ×14 bits |
| Data memory size | 32 ×8 bits RAM |
| I/O ports | 10 bidirectional I/O pins |
| Package type | 20‑pin SSOP (150 mil) |
The device operates from 2.0 V to 3.6 V.
It provides ten bidirectional I/O pins, with additional specialized pins for carrier output and wake‑up functions.
The maximum system clock is 4 MHz with a tolerance of ±3 %.
It is supplied in a 20‑pin SSOP (150 mil) package.