3.
There is no final VERIFY action taken at the end of download such
as in the COPY commands. Instead, a checksum of all the received data
bytes will be shown on the LCD display, letting the user to verify its
correctness manually by reading these IC's checksum in the master
textool.
4.2
When the LCD shows " Up Load Ready." message, following the
steps below to
Upload:
(This procedure can be abort at this time by depressing the key1+key3)
1.
Plug the IC into the master textool.
2.
running the PROMUTIL.EXE utility on the PC and follows its
instructions. (use /I switch to set the LPT port number as required.)
3.
At the end, there is checksum shows both on the LCD and the PC
monitor, to let user to verify its correctness.
4.
The user can abort the transfer at any time by disrupt the PC, usually
using the CTRL-C.
4.3
Voltage calibration and Verify-type setting:
The PROM8908 has a build-in calibration feature on the programming
voltage VCC and VPP. An offset value will be memorized and be used
to adjust all related voltage. The calibration need only be done once
within a period of months or when those voltage are in doubt.
Use a multimeter to measure the value on any one of the slave
textools.
You can't leave any IC in the textools when doing the calibration, or
it will be damaged.
After the voltage calibration, you can choose the verify type the
VERIFY command does. There are three types can be chose: verify
once at normal VCC voltage(the power-on default), verify twice at VCC
+- 5%, or verify twice at +- 10%. The choice will be effected
immediately until the power is off.
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