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8XC196NT USER'S MANUAL
Figure 15-9 shows the timings of the program word command with a repeated programming pulse
and auto increment. Asserting PALE# latches the command and address on the PBUS. Asserting
PROG# latches the data on the PBUS and starts the programming sequence. The PROG# signal
controls the programming pulse width. (Slave programming mode does not use the PPW regis-
ter.) After the rising edge of PROG#, the routine verifies the contents of the location that was just
programmed and asserts PVER to indicate successful programming. AINC# is optional and can
automatically increment the address for the next location. If you do not use AINC#, you must
send a new program word command to access the next word location.
RESET#
T
AVLL
PBUS
ADDR/COMMAND
(Ports 3/4)
T
SHLL
PALE#
PROG#
PVER
AINC#
*
Additional program pulses and verifications.
**
Measure from falling edge of last PROG# pulse in sequence.
15-22
T
DVPL
ADDR1
DATA1
T
LLAX
T
T
LLLH
LHPL
T
PLPH
Pulse 1
Figure 15-9. Program Word Waveform
T
PLDX
**
T
PHPL
*
*
T
PHVL
T
PHIL
ADDR2
DATA2
T
ILPL
T
ILVH
T
ILIH
A0121-01
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