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Intel® PXA255 Processor Developer’s Manual 3-23
Clocks and Power Manager
3.5.1 Power Manager Control Register (PMCR)
The PMCR is used to select the manner in which Sleep Mode is entered when the nVDD_FAULT
or the nBATT_FAULT pin is asserted low. When the IDAE bit is set, an Imprecise Data Abort
indication is sent to the CPU. The CPU then performs an abort routine. Software must ensure that
the abort routine sets the Sleep Mode configuration in the PWRMODE register (see Section 3.7.2,
“Power Mode Register (PWRMODE)”). The IDAE bit is cleared in any Reset and when Sleep
Mode exits. Software may also clear the IDAE bit when necessary. The PMCR must be protected
through Memory Management Unit (MMU) permissions.
This is a read/write register. Ignore reads from reserved bits. Write zeros to reserved bits.
Table 3-7. PMCR Bit Definitions
0x40F0_0000 PMCR Clocks and Power Manager
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
IDAE
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits Name Description
[31:1] —
Reserved.
Read undefined and must always be written with zeroes.
0IDAE
Imprecise Data Abort Enable.
0 – Allow immediate entry to sleep mode when nVDD_FAULT or nBATT_FAULT is
asserted.
1 – Force imprecise data abort signal to CPU to allow software to enter sleep mode
when nVDD_FAULT or nBATT_FAULT is asserted. Recommended mode.
Cleared on hardware, watchdog, and GPIO reset, or when sleep mode exits.