PIC17CXX Datasheet, PDF (5/16 Pages) Microchip Technology – EPROM Memory Programming Specification

EPROM Memory Programming Specification
FIGURE 3-2: RECOMMENDED PROGRAMMING ALGORITHM FOR USER EPROM
Start
Load new address
Pulse-count = 0
Set VDD = VDD min
Verify blank
Pass
Blank ^No
check?
Yes
Load new data
Set VDD = VDDP
Program using 100µs
pulse increment
pulse-count
Issue "Blank check fail"
error message
Set VDD = VDDmin
Programming error:
Issue error message
"“Fail verriiffyy @@ VVDDDDmin/max"”
Yes
No
Pass?
SSeett VDD = VDDDDmmaax.
Verify location(s)
Verify location for
correct data
Yes
Pass?
No
No ^Pulse-
count
>25
SSeet tVVDDDD == VVDDDDmminin
Verify location
Apply (3 x Pulse-count)
more 100 µs programming
pulses for margin
(Over programming)
Location fails
programming, issue error
message "Unable to
program location"
© 1996 Microchip Technology Inc.
DS30139I-page 5