Intel 8XC196NT User Manual page 375

8XC196NT USER'S MANUAL
Special
Port Pin Function
Signal
P2.1 PALE#
RXD
P2.2 PROG#
P2.4 AINC#
P2.6 CPVER
P2.7 PACT#
P4.7:0, PBUS
P3.7:0
15-12
Table 15-5. Pin Descriptions (Continued)
Program-
Type ming
Mode
I Slave Programming ALE Input
During slave programming, a falling edge causes the
device to read a command and address from the PBUS.
I Serial Receive Serial Data
During serial port programming, RXD receives data from
an external device.
I Slave Programming
During programming, a falling edge latches data on the
PBUS and begins programming, while a rising edge ends
programming. The current location is programmed with
the same data as long as PROG# remains asserted, so
the data on the PBUS must remain stable while PROG#
is active.
During a word dump, a falling edge causes the contents
of an OTPROM location to be output on the PBUS, while
a rising edge ends the data transfer.
I Slave Auto-increment
During slave programming, this active-low input enables
the auto-increment feature. (Auto increment allows
reading or writing of sequential OTPROM locations,
without requiring address transactions across the PBUS
for each read or write.) AINC# is sampled after each
location is programmed or dumped. If AINC# is asserted,
the address is incremented and the next data word is
programmed or dumped.
O Slave Cumulative Program Verification
During slave programming, a high signal indicates that all
locations programmed correctly, while a low signal
indicates that an error occurred during one of the
programming operations.
O Auto Programming Active
ROM-
During auto programming or ROM-dump, a low signal
dump
indicates that programming or dumping is in progress,
while a high signal indicates that the operation is
complete.
I/O Slave Address/Command/Data Bus
During slave programming, ports 3 and 4 serve as a
bidirectional port with open-drain outputs to pass
commands, addresses, and data to or from the device.
Slave programming requires external pull-up resistors.
Description