Summary Of Peripheral State During Low-Power Modes; Cpu And Peripherals In Low-Power Modes - Motorola ColdFire MCF5281 User Manual

Functional Description
7.3.2.25 BDM
Entering halt mode via the BDM port (by asserting the external BKPT pin) will cause the
CPU to exit any low-power mode.
7.3.2.26 JTAG
The JTAG (Joint Test Action Group) controller logic is clocked using the TCLK input and
is not affected by the system clock. The JTAG cannot generate an event to cause the CPU
to exit any low-power mode. Toggling TCLK during any low-power mode will increase the
system current consumption.
7.3.3

Summary of Peripheral State During Low-Power Modes

The functionality of each of the peripherals and CPU during the various low-power modes
is summarized in Table 7-7. The status of each peripheral during a given mode refers to the
condition the peripheral automatically assumes when the STOP instruction is executed and
the LPCR[LPMD] field is set for the particular low-power mode. Individual peripherals
may be disabled by programming its dedicated control bits. The wakeup capability field
refers to the ability of an interrupt or reset by that peripheral to force the CPU into run
mode.
Table 7-7. CPU and Peripherals in Low-Power Modes
Module
CPU
SRAM
Flash
System Integration Module
SDRAM Controller
Chip Select Module
DMA Controller
UART0, UART1 and UART2
2
I C Module
QSPI
DMA Timers
Interrupt controller
Fast Ethernet Controller
I/O Ports
Reset Controller
7-16
Peripheral Status
Wait Mode
Stopped No
Stopped No
Stopped No
3
Enabled Yes
Enabled No
Enabled No
Enabled Yes
2
Enabled Yes
2
Enabled Yes
2
Enabled Yes
2
Enabled Yes
2
Enabled Yes
2
Enabled Yes
Enabled No
3
Enabled Yes
MCF5282 User's Manual
1
/ Wakeup Capability
Doze Mode
Stopped No Stopped
Stopped No Stopped
Stopped No Stopped
3
Enabled Yes Stopped
Enabled No Stopped
Enabled No Stopped
Enabled Yes Stopped
2
Enabled Yes Stopped
2
Enabled Yes Stopped
2
Enabled Yes Stopped
2
Enabled Yes Stopped
2
Enabled Yes Enabled
2
Enabled Yes Stopped
Enabled No Enabled
3
Enabled Yes Enabled
Stop Mode
No
No
No
No
No
No
No
No
No
No
No
2
Yes
No
No
3
Yes
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