mc68hc705k1 Freescale Semiconductor, Inc, mc68hc705k1 Datasheet - Page 96

• Manufacturer Part Number: mc68hc705k1
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

Personality EPROM (PEPROM)
10.4 PEPROM Programming
10.5 PEPROM Reading
Technical Data
NOTE:
NOTE:
Factory-provided software for programming the PEPROM is available
through the Motorola web site at:
The circuit shown in
program the PEPROM with the factory-provided programming software.
To program the PEPROM, V
The PEPROM can also be programmed by user software with V
applied to the IRQ/V
PEPROM bit:
While the PEPGM bit is set and V
access bits that are to be left unprogrammed (erased).
In 3-pin RC oscillator configurations, the PEPROM cannot be
programmed by user software. If the voltage on IRQ/V
V
device operation will be disrupted.
This sequence shows how to read the PEPROM:
DD
1. Select a PEPROM bit by writing to PEBSR.
2. Set the PEPGM bit in PESCR.
3. Wait 3 ms.
4. Clear the PEPGM bit.
1. Select a bit by writing to PEBSR.
2. Read the PEDATA bit in PESCR.
3. Store the PEDATA bit in RAM or in a register.
4. Select another bit by changing PEBSR.
5. Continue reading and storing the PEDATA bits until the required
htt://mcu.motsps.com
Freescale Semiconductor, Inc.
, the oscillator will revert to a 2-pin oscillator configuration and
For More Information On This Product,
personality EPROM data is stored.
Personality EPROM (PEPROM)
Go to: www.freescale.com
PP
Figure 9-2. Programming Circuit
pin. This sequence shows how to program each
DD
must be greater than 4.5 Vdc.
PP
is applied to the IRQ/V
MC68HC705K1 — Rev. 2.0
PP
can be used to
is raised above
PP
pin, do not
PP