9 Feb 2010 0:55:05
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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 Alcad has posted this comment in the Clock/Xtal Forum |
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| clock stops! |
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Hello:
I have a problem with lpc764 microcontroller in an ESD test.
Sometimes, when we apply high voltage discharge, the xtal stop and the program donīt run.
Itīs very strange because the microcontroler donīt able to start the oscilator.
the xtal circuit is 8Mhz xtal and 33pF capacitors.
After we apply again the supply to the uC it start running normally.
someone have any suggestion to protect the circuit and avoid this type of failure?
Thank you
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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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