PHILIPS P89LPC920/921/922 80C51 8-bit microcontroller with two-clock core 2 KB/4 KB/8 KB 3 V low-power Flash with 256 Byte RAM USER MANUAL

About this manual

The Philips P89LPC920/921/922 series are 80C51‑compatible 8‑bit microcontrollers with a two‑cycle core, offering low‑power operation at 3 V. They provide flash memory options of 2 KB, 4 KB or 8 KB and 256 bytes of RAM for data storage.

This user manual describes the device architecture, pin configuration, special function registers, clock and oscillator options, power‑monitoring features, watchdog timer, I²C interface and flash programming procedures. It also includes detailed tables, diagrams and register maps to aid developers in hardware design and firmware development.

What's inside

• General Description
• Pin Configuration
• Special Function Registers
• Memory Organization
• CPU Clock Options
• Oscillator Options
• Power Monitoring Functions
• Watchdog Timer
• I2C Interface
• Flash Memory Programming

Specifications

Frequently asked questions

What flash memory sizes are available for the P89LPC920/921/922?

The device is offered with 2 KB, 4 KB, or 8 KB of flash memory.

How much RAM does the microcontroller provide?

It includes 256 bytes of on‑chip RAM.

What supply voltage is required for the device?

The microcontroller operates at a low‑power 3 V supply.