SH3000UM SEMTECH [Semtech Corporation], SH3000UM Datasheet - Page 22

• Manufacturer Part Number: SH3000UM
• Manufacturer: SEMTECH [Semtech Corporation]

©2006 Semtech Corp.
POWER MANAGEMENT
Application Information
1. INT disabled, uP initiates write access. Active high interrupt.
uBuddyIOOut
uPIOOut
CombinedIO
State
2. INT active (high), uP initiates write access
uBuddyIOOut
uPIOOut
CombinedIO
State
4. INT disabled, uP initiates read access
uBuddyIOOut
uPIOOut
CombinedIO
State
3. INT active (low), uP initiates write access
uBuddyIOOut
uPIOOut
CombinedIO
State
Idle
Idle
Idle
Idle
IN
T
IN
T
Pendin
g-start
Pendin
g-start
Pre-
start
Pre-
start
Start
Start
Pre-
start
Pre-
start
Post-
Start
Start
Post-
Start
Start
RW0
RW0
Post-
Start
Post-
Start
(continued)
Figure 7. Serial Communication Timing Diagram
RW1
RW0
RW1
RW0
RW2
RW1
RW2
RW1
RW2
RW2
A0
A0
A0
A0
A0
A0
IO/INT Timing Scenarios
...
...
...
...
...
A0
A0
...
A0
A0
A0
A0
...
...
...
...
A4
A4
...
A4
A4
A4
...
A4
Not authorized for release outside of Semtech
Guard0
Guard0
XXX
XXX
XXX
XXX
A4
A4
A4
A4
A4
A4
22
Guard0
Guard0
XXX
XXX
D0
D0
D0
XXX
XXX
D0
D0
D0
...
...
...
...
...
D0
D0
D0
D0
D0
D0
...
...
...
...
D7
D7
D7
D7
D7
D7
D7
D7
D7
P0
P0
P0
D7
D7
D7
P0
P0
P0
P1
P1
P1
P0
P0
P0
P1
P1
P1
P0
P0
P0
Guard1
Guard2
XXX
XXX
P1
P1
P1
P1
P1
P1
Guard1
Guard3
Guard1
ACK0
ACK0
ACK0
XXX
XXX
XXX
XXX
ACK1
ACK1
ACK1
ACK0
ACK0
ACK0
ACK0
ACK0
ACK0
Idle
Guard2
ACK1
ACK1
ACK1
ACK1
ACK1
ACK1
Guard3
Guard2
Guard2
If the interrupt did not get cleared,
then it will activate again here
If the interrupt did not get cleared,
then it will activate again here
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Guard3
Guard3
SH3003
Idle
- DRAFT
IN
T
IN
T
Pendin
g-start
Pendin
g-start