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ACE1202EM8X Fiches technique(PDF) 34 Page - Fairchild Semiconductor

No de pièce ACE1202EM8X
Description  Arithmetic Controller Engine (ACEx?? for Low Power Applications
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ACE1202EM8X Fiches technique(HTML) 34 Page - Fairchild Semiconductor

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ACE1202 Product Family Rev. B.1
Figure 35: HALT Register Definition
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
undefined
undefined
undefined
undefined
undefined
undefined
EIDLE
EHALT
Figure 34: Crystal (a) and RC (b) Oscillator Diagrams
33pF
33pF
1M
CKI
(G1)
CKO
(G0)
a)
C
VCC
R
CKI
(G1)
CKO
(G0)
b)
Normal Mode
LD HALT, #01h
Halt
Multi-Input
Wakeup
LD PMC, #00h
Resume
Normal Mode
Normal Mode
CLR WKEN
LD
HALT, #02h
IDLE
LD PMC, #00h
Resume
Normal Mode
Timer 0
Overflow
15.0 HALT Mode
The HALT mode is a power saving feature that almost completely
shuts down the device for current conservation. The device is
placed into HALT mode by setting the HALT enable bit (EHALT)
of the HALT register through software using only the “LD M, #”
instruction. EHALT is a write only bit and is automatically cleared
upon exiting HALT. When entering HALT, the internal oscillator
and all the on-chip systems including the LBD and the BOR
circuits are shut down.
The device can exit HALT mode only by the MIW circuit. There-
fore, prior to entering HALT mode, software must configure the
MIW circuit accordingly. (See Section 9) After a wakeup from
HALT, a 1ms start-up delay is initiated to allow the internal
oscillator to stabilize before normal execution resumes. Immedi-
ately after exiting HALT, software must clear the Power Mode
Clear (PMC) register by only using the “LD M, #” instruction. (See
Figure 36)
17.0 IDLE Mode
In addition to the HALT mode power saving feature, the device
also supports an IDLE mode operation. The device is placed into
IDLE mode by setting the IDLE enable bit (EIDLE) of the HALT
register through software using only the “LD M, #” instruction.
EIDLE is a write only bit and is automatically cleared upon exiting
IDLE. The IDLE mode operation is similar to HALT except the
internal oscillator, the Watchdog, and the Timer 0 remain active
while the other on-chip systems including the LBD and the BOR
circuits are shut down.
The device automatically wakes from IDLE mode by the Timer 0
overflow every 8192 cycles (see Section 6). Before entering IDLE
mode, software must clear the WKEN register to disable the MIW
block. Once a wake from IDLE mode is triggered, the core will begin
normal operation by the next clock cycle. Immediately after exiting
IDLE mode, software must clear the Power Mode Clear (PMC)
register by using only the "LD M, #" instruction. (See Figure 37)
Figure 36: Recommended HALT Flow
Figure 37: Recommended IDLE Flow


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