9 Feb 2010 0:55:24
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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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PDE51MX |
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PDS51E Daughterboard for P87C51Mx Devices |
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The PDE51MX daughterboard is a versatile bondout-based daughterboard which forms the basis for an affordable fully-featured in-circuit emulation system. In combination with a PDS51E motherboard it emulates all members of Philips 8051-derived P87C51Mx microcontroller family based on the Philips MX (Memory eXtension) core. It can also be used to emulate other sub-set microcontrollers including the 8xC51RA2/RB2/RC2/RD2 device families, and other similar devices from Philips and other manufacturers.
The PDE51MX system is supplied with a PLCC44 footprint adaptor compatible with a standard PLCC44 socket. Footprint adaptors for other packages types are in development.
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.
- fast easy-to-install USB interface to host PC.
- sophisticated Windows debugger supporting all popular compilers.
- execution up to 30 MHz (6-clock P87C51Mx - 60MHz 12-clock equivalent).
- 256k bytes of emulation memory for user code.
- 128k x 64 bits real-time trace buffer with 12 digital input channels.
- Trace record includes values read from or written to SFR's.
- programmable PLL-synthesised clock frequency (25kHz - 100MHz, 0.1%).
- programmable supply voltage (2.7 - 5.5V in 25mV steps).
- multiple breakpoint sources, unlimited execution address breakpoints.
- trigger output for synchronising external equipment with execution.
NOTE: Execution speed is guaranteed to the rated frequency of for P87C51Mx devices (24 MHz at a 5V supply) but is tested during production to 30 MHz.
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