MC68HC05P18 Datasheet, PDF (57/144 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Operating Modes
Low-Power Modes
6.3.2.2 Bulk Erase/Program Verify
To use the bootloader circuit to bulk erase, program, and verify the user
EEPROM, follow this sequence:
1. Close RESET switch so RESET is low upon power up.
2. Open PTC4 switch so PTC4 remains high during reset sequence.
3. Make sure code to be loaded into user EEPROM is in the external
EPROM (shown as 27C128).
4. Apply 12 V power to IRQ.
5. Release RESET.
6. Programming LED will be on during bulk erase and programming.
(The code in the 27C128 will be loaded into the user EEPROM
and MOR.)
7. When programming is finished, the programming LED will turn off.
8. When the verify is finished, verify LED will turn on.
9. Close RESET switch.
10. Remove 12 V from IRQ, then remove power.
NOTE:
Bootloader mode is the only mode in which the user can program the 8-K
user EEPROM and MOR. The 128-byte EEPROM can be programmed
in user mode.
6.4 Low-Power Modes
The MC68HC(8)05P18 is capable of running in a low-power mode in
each of its configurations. The WAIT and STOP instructions provide
modes that reduce the power required for the MCU by stopping various
internal clocks and/or the on-chip oscillator. The STOP and WAIT
instructions are not normally used if the COP watchdog timer is enabled
(MOR1, bit 0). The stop conversion to halt option (MOR1, bit 5) is used
to modify the behavior of the STOP instruction from stop mode to halt
mode. The flow of the stop, halt, and wait modes is shown in
Figure 6-2.
MC68HC(8)05P18 — Rev. 2.0
MOTOROLA
Operating Modes
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Advance Information
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