Peripheral Behavior In Low-Power Modes - Freescale Semiconductor MCF52277 Reference Manual

8.3.3.3 Doze Mode
Doze mode affects the processor in the same manner as wait mode, except that some peripherals define
individual operational characteristics in doze mode. Peripherals continuing to run and having the
capability of producing interrupts may cause the CPU to exit the doze mode and return to run mode.
Stopped peripherals restart operation on exit from doze mode, as defined for each peripheral.
8.3.3.4 Stop Mode
Stop mode affects the processor the same as the wait and doze modes, except that all clocks to the system
are stopped and the peripherals cease operation.
Stop mode must be entered in a controlled manner to ensure that any current operation is properly
terminated. When exiting stop mode, most peripherals retain their pre-stop status and resume operation.
Entering stop mode disables the SDRAMC, including the refresh counter. If
SDRAM is used, code is required to insure proper entry and exit from stop
mode. See
information.
8.3.4

Peripheral Behavior in Low-Power Modes

The functionality of each of the peripherals and CPU during the various low-power modes is summarized
in Table 8-9 and detailed in the following sections. In
mode refers to the condition the peripheral automatically assumes when the STOP instruction is executed
and the WCR[LPMD] field is set for the particular low-power mode. Individual peripherals may be
disabled by programming its dedicated control bits. The wake-up procedure field refers to the ability of an
interrupt or reset by that peripheral to force the CPU into run mode.
Module
ColdFire Core
SRAM
Clock Module
Power Management
Chip Configuration Module
Reset Controller
System Control Module
GPIO Module
Interrupt controller
Freescale Semiconductor
Chapter 19, "SDRAM Controller (SDRAMC),"
Table 8-9. CPU and Peripherals in Low-Power Modes
Wait Mode
Stopped
Stopped
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
MCF52277 Reference Manual, Rev. 1
NOTE
Table 8-9 the status of each peripheral during a given
1
Peripheral Status / Wake-up Procedure
Doze Mode
N/A Stopped
N/A Stopped
Interrupt Enabled
N/A Enabled
N/A Enabled
Reset Enabled
Reset Enabled
N/A Enabled
Interrupt Enabled
Power Management
for more
Stop Mode
N/A Stopped
N/A Stopped
Interrupt Program Interrupt
N/A Stopped
N/A Stopped
Reset Stopped Reset
Reset Enabled
N/A Stopped
Interrupt Stopped Interrupt
N/A
N/A
N/A
N/A
N/A
N/A
8-9