MC68HC05K0 Datasheet, PDF (90/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Technical Data
Freescale Semiconductor, Inc.
9.4 PEPROM Programming
Factory-provided software for programming the PEPROM is available
through the Motorola Web site at:
htt://mcu.motsps.com
The circuit shown in Figure 9-4 can be used to program the PEPROM
with the factory-provided programming software.
NOTE: The personality EPROM cannot be erased in parts offered without the
windowed package.
To program the PEPROM, V_DD must be greater than 4.5 Vdc.
The PEPROM also can be programmed by user software with V_PP
applied to the IRQ/V_PP pin. This sequence shows how to program each
PEPROM bit:
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.
NOTE: While the PEPGM bit is set and V_PP is applied to the IRQ/V_PP pin, do not
access bits that are to be left unprogrammed (erased).
In the 3-pin RC oscillator configuration, the PEPROM cannot be
programmed by user software. If the voltage on IRQ/V_PP is raised above
V_DD, the oscillator will revert to a 2-pin oscillator configuration and
device operation will be disrupted. The 2-pin RC and crystal
configurations are not affected.
Technical Data
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Personality EPROM (MC68HC05K1 Only)
For More Information On This Product,
Go to: www.freescale.com