MC68HC711xxxx Motorola, MC68HC711xxxx Datasheet - Page 53
MC68HC711xxxx
Manufacturer Part Number
MC68HC711xxxx
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC68HC711XXXX.pdf
(268 pages)
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- Download datasheet (4Mb)
2.4.1 Programming an Individual EPROM Address
M68HC11E Family — Rev. 5
MOTOROLA
NOTE:
Using the on-chip EPROM/OTPROM programming feature requires an external
12-volt nominal power supply (V
the EPROM/OTPROM programming register (PPROG).
PPROG is the combined EPROM/OTPROM and EEPROM programming register
on all devices with EPROM/OTPROM except the MC68HC711E20. For the
MC68HC711E20, there is a separate register for EPROM/OTPROM programming
called the EPROG register.
As described in the following subsections, these two methods of programming and
verifying EPROM are possible:
In this method, the MCU programs its own EPROM by controlling the PPROG
register (EPROG in MC68HC711E20). Use these procedures to program the
EPROM through the MCU with:
Any operating mode can be used.
This example applies to all devices with EPROM/OTPROM except for the
MC68HC711E20.
This example applies only to MC68HC711E20.
1. Programming an individual EPROM address
2. Programming the EPROM with downloaded data
•
•
•
EPROG
EPROG
The ROMON bit set in the CONFIG register
The 12-volt nominal programming voltage present on the XIRQ/V
The IRQ pin must be pulled high.
LDAB
STAB
STAA
LDAB
STAB
JSR
CLR
LDAB
STAB
STAA
LDAB
STAB
JSR
CLR
Operating Modes and On-Chip Memory
#$20
$103B
$0,X
#$21
$103B
DLYEP
$103B
#$20
$1036
$0,X
#$21
$1036
DLYEP
$1036
Set ELAT bit in (EPGM = 0) to enable
EPROM latches.
Store data to EPROM address
Set EPGM bit with ELAT = 1 to enable
EPROM programming voltage
Delay 2–4 ms
Turn off programming voltage and set
to READ mode
Set ELAT bit (EPGM = 0) to enable
EPROM latches.
Store data to EPROM address
Set EPGM bit with ELAT = 1 to enable
EPROM programming voltage
Delay 2–4 ms
Turn off programming voltage and set
to READ mode
PPE
). Normal programming is accomplished using
Operating Modes and On-Chip Memory
EPROM/OTPROM
PPE
Data Sheet
pin
53
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