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Serially programmed 8051 FLASH micro'sIf 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.
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.
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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.