Clock, Reset, and Power Control (CRP)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
5-16
Freescale Semiconductor
Preliminary
5.3
Functional Description
5.3.1
Low-Power Modes
The CRP support two low power modes of operation, SLEEP and STOP. The primary difference between
these modes is the standard cell logic is powered down in SLEEP mode, but remains powered and static
in STOP mode. In order to achieve the functional requirements of these low power modes, the CRP
provides the following functionality: control of the on-chip voltage regulator, LVI circuits, power gates,
and well/source bias circuitry; control of external pin output state retention circuitry; wakeup monitoring
on external pins or internal RTC; external reset pin monitoring to allow user to abort the low power mode;
system recovery on wakeup; and support for JTAG and Nexus debug capability. The following sections
discuss in detail the entry sequence, the operation, and the exit sequence for the low power modes.
Table 5-12. CRP_SOCSC Field Descriptions
Field
Description
LVI5IE
LVI5 Interrupt Enable. TheLVI5IE bit enables interrupts requests to the system if LVI5F is asserted.
0 LVI5 interrupts disabled
1 LVI5 interrupts enabled
LVI5HIE
LVI5 High Interrupt Enable. TheLVI5HIE bit enables interrupts requests to the system if LVI5HF is asserted.
0 LVI5H interrupts disabled
1 LVI5H interrupts enabled
LVI5F
LVI 5V Interrupt Flag. The LVI5F bit indicates that the LVI5 LVI circuit has detected that the 5 V supply is below
the defined nominal limit. LVI5F is cleared by writing a 1 to LVI5F. Writing a 0 to LVI5F has no effect.
0 No LVI5 interrupt
1 LVI5 interrupt
LVI5HF
LVI 5V High Interrupt Flag. The LVI5HF bit indicates that the LVI5H LVI circuit has detected that the 5V supply
is below the defined high limit. LVI5HF is cleared by writing a 1 to LVI5HF. Writing a 0 to LVI5HF has no effect.
0 No LVI5H interrupt
1 LVI5H interrupt
LVI5LOCK
LVI5 Lock. The LVI5LOCK bit disables writes to the LVI5RE register bit. After it is set, this bit will remain set
until the next POR.
0 LVI5RE writeable
1 LVI5RE not writeable
LVI5RE
LVI5 Reset Enable. The LVI5RE bit enables the reset function of the LVI5.
0 LVI5 does not generate a reset when LVI5F is set
1 LVI5 generates a reset when the LVI5F is set
bits 6–14
Reserved.
BYPDIS
REFBYPC Disable. The BYPDIS bit disables the REFBPYC pin which allows for a faster eQADC recovery
time after exit from a low power stop or sleep mode.
0 REFBYPC enabled
1 REFBYPC disabled
bits 16–31
Reserved.