MC68HC705JJ7 Datasheet, PDF (50/164 Pages) Freescale Semiconductor, Inc – Microcontrollers

Operating Modes
OM2 OM1
0
0
0
1
1
0
1
1
.
Table 6-1. Oscillator Selection
Oscillator
Selected
Internal
External
Internal
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 Chapter 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 Chapter 4 Interrupts for more details.
6.3 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 Advance Information Data Sheet, Rev. 4.1
50
Freescale Semiconductor