Chapter 3 Modes of Operation

 

Stop4

8

Stop3

4

 

 

 

9

7

 

 

 

 

 

1

 

 

 

 

 

 

10

 

 

 

Halt

 

Run

Stop2

LPrun

 

6

 

2

 

11

 

 

 

 

 

Wait

5

LPwait

3

 

 

 

Figure 3-3. All Allowable Power Mode Transitions for MCF51QE128/64/32

Table 3-2defines triggers for the various state transitions shown in Figure 3-2.

Table 3-2. Triggers for Transitions Shown in Figure 3-2

Transition #

From

To

Trigger

 

 

 

 

 

Run

LPrun

Configure settings shown in Table 3-1, switch

 

LPR=1 last

 

 

 

 

 

 

 

1

 

 

Clear LPR

 

 

 

 

 

 

LPrun

Run

Interrupt when LPWUI=1

 

 

 

 

 

 

 

Negative transition on enabled BKGD/MS pin.

 

 

 

 

 

Run

Stop2

Pre-configure settings shown in Table 3-1, execute

 

STOP instruction

2

 

 

 

 

 

 

 

 

 

 

 

1 or

 

Stop2

Run

Assert zero on PTA5/IRQ/TPM1CLK/RESET

 

RTC timeout. Reload environment from RAM

 

 

 

 

 

 

 

 

LPrun

LPwait

Pre-configure settings shown in Table 3-1, execute

3

STOP instruction

 

 

 

 

 

 

 

 

LPwait

LPrun

Interrupt when LPWUI=0

 

 

 

 

4

LPrun

Stop3

Execute STOP instruction

 

 

 

 

 

Stop3

LPrun

Interrupt when LPWUI=0

 

 

 

 

 

5

LPwait

Run

Interrupt when LPWUI=1

 

 

 

 

 

Run

LPwait

Not supported.

 

 

 

 

 

 

Run

Wait

Pre-configure settings shown in Table 3-1, execute

6

STOP instruction

 

 

 

 

 

 

 

 

 

 

 

 

Wait

Run

Interrupt

 

 

 

 

 

Run

Stop4

Pre-configure settings shown in Table 3-1, execute

7

STOP instruction

 

 

 

 

 

 

 

 

 

 

 

 

Stop4

Run

Interrupt

 

 

 

 

 

 

 

MCF51QE128 MCU Series Reference Manual, Rev. 3

 

 

Freescale Semiconductor

47

 

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Freescale Semiconductor MCF51QE128RM manual Triggers for Transitions Shown in Figure, Transition # From Trigger