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Power Management
8-2
Freescale Semiconductor
8.2.1
Wake-up Control Register
Implementation of low-power stop mode and exit from a low-power mode via an interrupt require
communication between the core and logic associated with the interrupt controller. The WCR enables
entry into low-power modes, and includes the setting of the interrupt level needed to exit a low-power
mode.
NOTE
The setting of the low-power mode select field, LPCR[LPMD], determines
which low-power mode the device enters when a STOP instruction is issued.
The following sequence of operations is generally needed to enable this functionality:
1. The WCR register is programmed, setting the ENBWCR bit and the desired interrupt priority level.
2. At the appropriate time, the processor executes the privileged STOP instruction. After the
processor has stopped execution, it asserts a specific processor status (PST) encoding. Issuing the
STOP instruction when the WCR[ENBWCR] bit is set causes the SCM to enter the mode specified
in LPCR[LPMD].
3. The entry into a low-power mode is processed by the low-power mode control logic, and the
appropriate clocks (usually those related to the high-speed processor core) are disabled.
4. After entering the low-power mode, the interrupt controller enables a combinational logic path
which evaluates any unmasked interrupt requests. The device waits for an event to generate an
interrupt request with a priority level greater than the value programmed in WCR[PRILVL].
5. After an appropriately high interrupt request level arrives, the interrupt controller signals its
presence, and the SCM 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.
0xFC0A_0010 Miscellaneous Control Register (MISCCR)
2
16
R/W
See Section
0xFC0A_0012 Clock Divider Register (CDR)
16
R/W
0x0001
1
User access to supervisor only address locations have no effect and result in a bus error
2
The MISCCR and CDR registers are described in
Chapter 9, “Chip Configuration Module (CCM).”
Address: 0xFC04_0013 (WCR)
Access: Supervisor read/write
7
6
5
4
3
2
1
0
R
ENBWCR
0
0
0
0
PRILVL
W
Reset:
0
0
0
0
0
0
0
0
Figure 8-1. Wake-up Control Register (WCR)
Table 8-1. Power Management Memory Map (continued)
Address
Register
Width
(bits)
Access
Reset Value
Section/Page
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...