31 Jul 2010 7:04:15
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 Acqura now have Philips microcontrollers available for sale. If you need P89C668, P89C669, LPC76x or LPC900 family devices, check out our low MOQ's
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Take a look at our new forums. If you have a question about the 8xC51, LPC900, or MX families (or any 8051-related query) then ask your question here.
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| User gudjon has posted this comment in the Interrupts Forum |
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| Interrupt Pulse length in P89C668 |
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Hi
I have been interfacing an AD7822 AD converter to a P89C668. The pulse length of the EOC (end of conversion) signal from the converter seems to be to short for the microcontroller to catch it every time. I could solve it by adding a multivibrator into the circuit, making the pulse longer but I would like to spare that chip if possible.
Does anyone have any idea?
Thanks
Gudjon
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| Click here to see the whole discussion thread. |
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PDB554-6 |
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PDS51 Daughterboard for P8xC552 and P8xC554 Devices |
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 This item is currently unavailable from Acqura Systems. Please contact us at sales@acqura.com for information on availablity.
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The PDB554-6 is a versatile bondout-based daughterboard which forms the basis for an affordable fully-featured in-circuit emulation system. In combination with a PDS51-Mk2A motherboard it emulates the 8xC552 and 8xC554 variants (including both 6-clock and 12-clock core sub-variants) of Philips 8051-derived microcontrollers, and can be used to support development with similar microcontrollers from other manufacturers.
A footprint adaptor compatible with a standard PLCC68 device socket is supplied. A footprint adaptor for the alternate LQFP64 package is available as a separate item.
The resulting emulation system allows complete control and tracing of execution of a user's program, and access to all registers and memory spaces of the target microcontroller, without consuming any device resources or introducing wait-states or other non-standard behaviour.
Features include:
- transparent real-time in-circuit emulation with execution trace.
- flexible motherboard + daughterboard + adaptor architecture.
- sophisticated Windows debugger supporting all popular compilers.
- execution up to 15 MHz (6-clock) or 30 MHz (12-clock) at a 5V supply (see note)
- 64k bytes of emulation memory for user code.
- 28k x 32 bits real-time trace buffer with 12 digital input channels.
- programmable PLL-synthesised clock frequency.
- multiple breakpoint sources, unlimited execution address breakpoints.
- trigger output for synchronising external equipment with execution.
- footprint adapters for various device packages.
NOTE: Execution speed is conservatively rated - the PDB554-6 daughterboard is tested during production at higher speeds and will typically run at 17/34 MHz.
The PDB554-6 daughterboard can be used with both PDS51-Mk2A and PDS51-Mk2 motherboards. It is not compatible with the earlier PDS51 motherboard since this lacks support for the PLL-synthesised clock feature.
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