T89C51RB2/RC2 is a high performance FLASH version of the 80C51 8-bit microcontrollers. It contains a 16K or 32Kbytes Flash memory block for program and data. The 16 Kbytes or 32 Kbytes FLASH memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin. The T89C51RB2/RC2 retains all features of the 80C52 with 256 bytes of internal RAM, a 7-source 4-level interrupt controller and three timer/counters. In addition, the T89C51RB2/RC2 has a Programmable Counter Array, an XRAM of 1024 byte, a Hardware Watchdog Timer, a Keyboard Interface, a SPI Interface, a more versatile serial channel that facilitates multiprocessor communication (EUART) and a speed improvement mechanism (X2 mode). Pinout is the standard 40/44 pins of the C52. The fully static design of the T89C51RB2/RC2 allows to reduce system power consumption by bringing the clock frequency down to any value, even DC, without loss of data. The T89C51RB2/RC2 has 2 software-selectable modes of reduced activity and 8 bit clock prescaler for further reduction in power consumption. In the Idle mode the CPU is frozen while the peripherals and the interrupt system are still operating. In the power-down mode the RAM is saved and all other functions are inoperative.
The T89C51RB2/RC2 is an 8‑bit microcontroller compatible with the 80C52 core. It offers 16 KB or 32 KB on‑chip FLASH for program and data, 256 bytes of internal RAM, an additional 1024‑byte XRAM, three 16‑bit timer/counters, a hardware watchdog, and multiple serial interfaces including SPI and an enhanced UART.
The device is supplied in PDIL40, PLCC44 and VQFP44 packages, operates from 4.5‑5.5 V (or 2.7‑3.6 V low‑voltage version), and supports commercial (0‑70 °C) and industrial (‑40‑85 °C) temperature ranges. Detailed pin‑out tables, SFR mappings, and ordering information are included.
| Flash memory size | 16 KB or 32 KB |
|---|---|
| XRAM size | 1024 bytes |
| Internal RAM | 256 bytes |
| CPU clock speed (standard mode) | 40 MHz |
| CPU clock speed (X2 mode) | 20 MHz |
| Power‑down current (3 V) | 50 µA |
| Power consumption (industrial, 5 V) | 150 µA |
| Supply voltage | 4.5‑5.5 V or 2.7‑3.6 V |
| Operating temperature (commercial) | 0 °C to 70 °C |
| Operating temperature (industrial) | -40 °C to 85 °C |
| Available packages | PDIL40, PLCC44, VQFP44 |
| Interrupt sources | 10 sources with 4 priority levels |
| Timer/counters | Three 16‑bit timer/counters |
The device provides either 16 KB or 32 KB of on‑chip FLASH for program and data storage.
It includes 1024 bytes of on‑chip expanded RAM (XRAM).
It is available in PDIL40, PLCC44, and VQFP44 packages.