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8XC196K x , J x , CA USER'S MANUAL
16.7 ENTERING PROGRAMMING MODES
To execute programs properly, the device must have these minimum hardware connections:
XTAL1 driven, unused input pins strapped, and power and grounds applied. Follow the operating
conditions specified in the datasheet. Place the device into programming mode by applying V
voltage (+12.5 V) to EA# during the rising edge of RESET#.
16.7.1 Selecting the Programming Mode
The PMODE (P0.7:4) value controls the programming mode. PMODE is sampled on the rising
edge of RESET#. You must reset the device to switch programming modes. Table 16-7 lists the
PMODE value for each programming mode. All other PMODE values are reserved.
16.7.2 Power-up and Power-down Sequences
When you are ready to begin programming, follow these power-up and power-down procedures.
Failure to observe these warnings will cause permanent device damage.
•
Voltage must not be applied to V
•
The V
voltage must be within 1 volt of V
PP
go above 4.5 volts until V
•
The V
maximum voltage must not be exceeded.
PP
•
EA# must reach programming voltage before V
•
The PMODE pins (P0.7:4) must be in their desired states before RESET# rises.
•
All voltages must be within the ranges specified in the datasheet and the oscillator must be
stable before RESET# rises.
•
The power supplies to the V
of glitches and spikes.
•
All V
pins must be well grounded.
SS
16-14
Table 16-7. PMODE Values
PMODE Value
Programming Mode
(Hex)
0
Serial port programming
5
Slave programming
6
ROM-dump
C
Auto programming
WARNING
while V
PP
CC
CC
is at least 4.5 volts.
CC
, V
, EA# and RESET# pins must be well regulated and free
CC
PP
is low.
while V
is less than 4.5 volts. V
CC
does so.
PP
PP
must not
PP
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