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Serially programmed 8051 FLASH micro's
If you haven't come across them already, we'd like to introduce our favourite chips - FLASH 8051 microprocessors - now made by a range of different manufacturers - and specifically we'd like to tell you about the Philips P89LPC932, the Philips P89C51RD+ and Temic T89C51RD2.
When it comes to the types of microprocessor to use in a project,
there are as many best choices as there are design engineers.
But some things just make good sense - and serially programmed
flash microcontrollers are one of them. When the main program
code can be downloaded to the target board through a serial
port, the whole manufacturing process becomes a lot easier.
When that code is also in flash memory, so that it can be updated
without chip replacement when the inevitable new program version
is required, field support is also a lot easier.
A lot of engineers have been making serially programmed FLASH program memory products for years - the difference here is that there is no requirement for a separate FLASH memory chip - the memory is within the microcontroller. Frequently there may be an external signal of some type required to prevent erroneous programming.
Flash microcontrollers still have one downside - they tend to use more power than one time programmable, EPROM or ROM memory microcontrollers. But that is becoming less and less of an issue, with, for example, the Philips P89LPC932 microcontroller now powering down to idle at a typical 3.25ma at 3.6V supply.
- The Philips P89LPC932:
- 28 pin TSSOP - 25 useable I/O pins, all in a 9mm x 7mm PCB area!
- Great Price (we can't quote - but about $2 US in 1000+ pcs)
- 8kbytes FLASH, 512 bytes EEPROM, and 768 bytes RAM
- On board +/- 2% accuracy oscillator - you can omit the Crystal
- Runs 6x normal 8051 speed; Standard 7.37Mhz, Crystal to 12Mhz
- On board Low Voltage Reset/Watchdog
- Runs 2.4 - 3.6V - but actually 2.7 - 3.6V with brownout detect
- 20ma output drive, schmitt inputs, comparator inputs, 5v tolerant I/O
- UART, SPI, I2C, 2xDPTR, Capture/Compare, Versatile clocks.
If you are still using the AT89C51 and AT89C52 microprocessors from Atmel (FLASH, but not serially programmed) we still sell an AT89C51 programmer for these devices - very similar to the AT89C2051 programmer we sell, same price, same features, - works under any operating system, quite fast to program (6-12 seconds depending on how much code to be programmed).
- Other material
- P89LPC932 Data sheet
- Just as important (or even more so) P89LPC932 User manual
- We have a suggested ISP programming header
- The flavour of the day downloading tool: FlashMagic
- We have an older command line downloading tool: FLASH51
- Index of the whole Philips 8051 family
- The Keil MCB900 Evaluation kit for the P89LPC932
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Quality custom electronics at the right price -
AirBorn Electronics: www.airborn.com.au
Phone: (61)(2)9925 0325
Mail: P O Box 1491, North Sydney, NSW 2059, Australia
Contact: Steven Murray, Manager