MC68HC05K1 FREESCALE [Freescale Semiconductor, Inc], MC68HC05K1 Datasheet - Page 62

• Manufacturer Part Number: MC68HC05K1
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Technical Data
6.5 Halt Mode
6.6 Data-Retention Mode
Technical Data
If the mask option to disable the STOP instruction is selected, a STOP
instruction puts the MCU in halt mode. Halt mode is identical to wait
mode, except that a recovery delay of from 1 to 4064 internal clock
cycles occurs when the MCU exits halt mode. If the mask option to
disable the STOP instruction is selected, the COP watchdog cannot be
turned off inadvertently by a STOP instruction.
Figure 6-1
In data-retention mode, the MCU retains random-access memory (RAM)
contents and CPU register contents at V
The data-retention feature allows the MCU to remain in a low
power-consumption state during which it retains data, but the CPU
cannot execute instructions.
To put the MCU in data-retention mode:
To take the MCU out of data-retention mode:
1. Drive the RESET pin to a logic 0.
2. Lower the V
1. Return V
2. Return the RESET pin to a logic 1.
Freescale Semiconductor, Inc.
For More Information On This Product,
continuously during data-retention mode.
shows the sequence of events in stop, wait, and halt modes.
Go to: www.freescale.com
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Low-Power Modes
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to normal operating voltage.
voltage. The RESET pin must remain low
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
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voltages as low as 2.0 Vdc.