User's Manual

Frequently Asked Questions

A-8

2) C-SPY can download data into RAM, INFORMATION, and Flash

MAIN memories. A warning message is output if an attempt is made

to download data outside of the device memory spaces.

3) C-SPY can debug applications that utilize interrupts and low

power modes. Refer to FAQ, Debugging #24).

4) C-SPY cannot access the device registers and memory while the

device is running. C-SPY will display “-“ to indicate that a

to access device registers and memory. Any displayed

5) When C-SPY is started, the Flash memory is erased and the

opened file is programmed in accordance with the download options

as set in PROJECT->OPTIONS->FET DEBUGGER->DOWNLOAD

CONTROL->DOWNLOAD CONTROL. This initial erase and program

operations can be disabled selecting PROJECT->OPTIONS-> FET

DEBUGGER->DOWNLOAD CONTROL ->DOWNLOAD CONTROL-

>SUPPRESS DOWNLOAD. Programming of the Flash can be initiated

manually with EMULATOR->INIT NEW DEVICE.

6) The parallel port designators (LPTx) have the following physical

addresses: LPT1: 378h, LPT2: 278h, LPT3: 3BCh. The configuration

of the parallel port (ECP, Compatible, Bidirectional, Normal) is not

significant; ECP seems to work well. Refer FAQ, Debugging #1) for

additional hints on solving communication problems between C-SPY

and the device.

7) C-SPY asserts RST/NMI to reset the device when C-SPY is started

and when the device is programmed. The device is also reset by the C-

SPY RESET button, and when the device is manually reprogrammed

(EMULATOR->INIT NEW DEVICE), and when the JTAG is

resynchronized (EMULATOR->RESYNCHRONIZE JTAG). When

RST/NMI is not asserted (low), C-SPY sets the logic driving RST/NMI

to high-impedance, and RST/NMI is pulled high via a resistor on the

PCB.

RST/NMI is asserted and negated after power is applied when C-SPY

is started. RST/NMI is then asserted and negated a second time after

device initialization is complete.

Within C-SPY, EMULATOR->”POWER ON” RESET will cycle the

power to the target to effect a reset.

8) C-SPY can debug a device whose program reconfigures the

function of the RST/NMI pin to NMI.

9) The level of the XOUT/TCLK pin is undefined when C-SPY resets

the device. The logic driving XOUT/TCLK is set to high-impedance at

all other times.

10) When making current measurements of the device, ensure that

the JTAG control signals are released (EMULATOR->RELEASE

JTAG ON GO), otherwise the device will be powered by the signals on