Table of Contents
Advertisement
16.6 PROGRAMMING MODE PINS
Figure 16-4 illustrates the signals used in programming and Table 16-6 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 16-7 on page
16-13). 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
Figure 16-4. Pin Functions in Programming Modes
Special-
Port Pin
function
Signal
P0.7:4
PMODE.3:
PMODE.0
P2.0
PVER
P2.1
PALE#
PROGRAMMING THE NONVOLATILE MEMORY
V
PP
EA#
4
P0.7:4
8XC196 Device
Table 16-6. 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 16-7 on page
16-13 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.
I
Slave
Programming ALE Input
During slave programming, a falling edge causes
the device to read a command and address from the
PBUS.
Get other manuals https://www.bkmanuals.com
P4.7:0
PBUS
P3.7:0
P2.7
PACT#
P2.6
CPVER
P2.4
AINC#
P2.2
PROG#
P2.1
PALE#
P2.0
PVER
Description
A2839-02
16-11
Advertisement
Table of Contents
