Key facts
- Brand
- Philips
- Model
- P921
- Industry
- Industrial
- Documents
- 4
- Languages
- EN
- Last added
- 2012-05-02
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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 handbook
The Philips P89LPC920/921/922 is an 80C51‑compatible 8‑bit microcontroller featuring a two‑cycle core, low‑power operation at 3 V, and on‑chip flash memory options of 2 KB, 4 KB or 8 KB. It includes 256 Byte of data RAM, a range of peripheral interfaces (UART, I²C, timers, comparators, watchdog, and real‑time clock) and extensive power‑management functions.
The manual provides detailed descriptions of the pin configuration, clock options, interrupt architecture, I/O port modes, and programming resources such as in‑system programming (ISP) and flash memory usage. It also covers special features like keypad interrupt, watchdog timer, and flash security bytes, making it a comprehensive reference for designers and developers.
Philips P921 specifications
| Microcontroller architecture | 8-bit 80C51 core with two‑cycle instructions |
|---|---|
| Flash memory size | 2 KB, 4 KB or 8 KB |
| RAM size | 256 Byte |
| Package types | 20‑Pin TSSOP, DIP |
| Operating voltage | 3 V low‑power |
Source: Philips P89LPC920/921/922 8-bit Microcontroller User Manual
All Philips P921 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
- Philips P89LPC920/921/922 8-bit Microcontroller User Manual 123 p
- 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 handbook 124 p
- 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 124 p
Questions answered in these manuals
What flash memory capacities are available for the P89LPC920/921/922?
The device is offered with 2 KB, 4 KB, or 8 KB of on‑chip flash memory.
From: Philips P89LPC920/921/922 8-bit Microcontroller User Manual
How much RAM does the P89LPC920/921/922 provide?
Each variant includes 256 Byte of internal RAM.
From: Philips P89LPC920/921/922 8-bit Microcontroller User Manual
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 is the operating voltage range for the P89LPC920/921/922/9221?
The devices operate from 2.4 V to 3.6 V Vpp, and the I/O pins are 5 V tolerant.
How many I/O pins are available on these microcontrollers?
They have a minimum of 15 I/O pins and can provide up to 18 pins when using the on‑chip oscillator and reset options.