Programming Mode Pins - Intel 8XC196NT User Manual

15.6 PROGRAMMING MODE PINS

Figure 15-4 illustrates the signals used in programming and Table 15-5 describes them. The EA#,
V , and PMODE pins combine to control entry into programming modes. You must configure
PP
the PMODE (P0.7:4) pins to select the desired programming mode (see Table 15-6 on page
15-13). Each programming routine configures the port 2 pins to operate as the appropriate spe-
cial-function signals. Ports 3 and 4 automatically serve as the PBUS during programming.
Programming
Voltage
PMODE.3:0
† For auto programming, P1.2:1 replace P4.7:6 as the high address bits.
Figure 15-4. Pin Functions in Programming Modes
Special
Port Pin Function
Signal
P0.7:4 PMODE.3:
PMODE.0
P2.0 PVER
TXD
PROGRAMMING THE NONVOLATILE MEMORY
V
PP
EA#
4
P0.7:4
8XC196 Device
Table 15-5. Pin Descriptions
Program-
Type ming
Mode
I All Programming Mode Select
Determines the programming mode. PMODE is sampled
after a device reset and must be static while the part is
operating. (Table 15-6 on page 15-13 lists the PMODE
values and programming modes.)
O Slave Programming Verification
Auto
During slave or auto programming, PVER is updated
after each programming pulse. A high output signal
indicates successful programming of a location, while a
low signal indicates a detected error.
O Serial Transmit Serial Data
During serial port programming, TXD transmits data from
the OTPROM to an external device.
P4.7:0
PBUS †
P3.7:0
P2.7 PACT#
P2.6 CPVER
P2.4 AINC#
P2.2 PROG#
P2.1 PALE#/RXD
P2.0 PVER/TXD
Description
A0314-03
15-11