MC68HC705JP7 Datasheet, PDF (77/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Operating Modes
Low-Power Modes
.
Table 6-1. Oscillator Selection
OM2 OM1
Oscillator
Selected
0
0
Internal
0
1
External
1
0
Internal
1
1
Internal
Internal
Low-Power
Oscillator
(LPO)
Enabled
Disabled
Enabled
Enabled
External Pin
Oscillator
(EPO)
Disabled
Enabled
Disabled
Enabled
Power
Consumption
Lowest
Normal
Lowest
Normal
NOTE:
When switching from LPO to EPO, the user must be careful to ensure
that the EPO has been enabled and powered up long enough to stabilize
before shifting clock sources.
IRQF — External Interrupt Request Flag
The IRQF flag is a clearable, read-only bit that is set when an external
interrupt request is pending. Refer to Section 4. Interrupts for more
details.
IRQR — Interrupt Request Reset Bit
This write-only bit clears the IRQF flag bit and prevents redundant
execution of interrupt routines. Refer to Section 4. Interrupts for
more details.
6.4 Low-Power Modes
Four modes of operation reduce power consumption:
• Stop mode
• Wait mode
• Halt mode
• Data-retention mode
Figure 6-2 shows the sequence of events in stop, wait, and halt modes.
MC68HC705JJ7 • MC68HC705JP7 — REV 4
MOTOROLA
Operating Modes
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