Motorola ColdFire MCF5281 - Manual (Page 139)

Power Management
Freescale Semiconductor 7-3
NOTE
Only fixed (external) interrupt can bring a device out of stop mode. To exit
from other low-power modes, such as doze or wait, either fixed or
programmable interrupts may be used; however, the module generating the
interrupt must be enabled in that particular low-power mode.
5. Once an appropriately-high interrupt request level arrives, the interrupt controller signals its
presence, and the SIM responds by asserting the request to exit low-power mode.
6. The low-power mode control logic senses the request signal and re-enables the appropriate
clocks.
7. With the processor clocks enabled, the core processes the pending interrupt request.
7 6 4 3 0
Field ENBSTOP XLPM_IPL —
Reset 1/0 0 1/0 0 Undefined
R/W R/W
Address IPSBAR + 0x012
Figure 7-1. Low-Power Interrupt Control Register (LPICR)
Table 7-2. LPICR Field Descriptions
Bits Name Description
7 ENBSTOP Enable low-power stop mode.
0 Low-power stop mode disabled
1 Low-power stop mode enabled. Once the core is stopped and the signal to enter stop
mode is asserted, processor clocks can be disabled.
6–4 XLPM_IPL Exit low-power mode interrupt priority level. This field defines the interrupt priority level
needed to exit the low-power mode.Refer to
Table 7-3 .
3–0 — Reserved, should be cleared.
Table 7-3. XLPM_IPL Settings
XLPM_IPL[2:0] Interrupts Level Needed to Exit Low-Power Mode
000 Any interrupt request exits low-power mode
001 Interrupt request levels [2-7] exit low-power mode
010 Interrupt request levels [3-7] exit low-power mode
011 Interrupt request levels [4-7] exit low-power mode
100 Interrupt request levels [5-7] exit low-power mode
101 Interrupt request levels [6-7] exit low-power mode
11x Interrupt request level [7] exits low-power mode
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3