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DS26503 bảng dữ liệu(PDF) 39 Page - Dallas Semiconductor

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Giải thích chi tiết về linh kiện  T1/E1/J1 BITS Element
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DS26503 T1/E1/J1 BITS Element
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7.6 Information Registers
Information registers operate the same as status registers except they cannot cause interrupts. INFO3
register is a read-only register and it reports the status of the E1 synchronizer in real time. INFO3
information bits are not latched, and it is not necessary to precede a read of these bits with a write.
7.7 Interrupt Information Registers
The Interrupt Information Registers provide an indication of which Status Registers (SR1 through SR3)
are generating an interrupt. When an interrupt occurs, the host can read IIR to quickly identify which of
the three status registers are causing the interrupt.
Register Name:
IIR
Register Description:
Interrupt Information Register
Register Address:
13h
Bit #
7
6
5
4
3
2
1
0
Name
—
—
—
—
SR4
SR3
SR2
SR1
Default
0
0
0
0
0
0
0
0
HW
Mode
X
X
X
X
X
X
X
X
Bit 0/Status Register 1 (SR1).
0 = Status Register 1 interrupt not active.
1 = Status Register 1 interrupt active.
Bit 1/Status Register 2 (SR2).
0 = Status Register 1 interrupt not active.
1 = Status Register 1 interrupt active.
Bit 2/Status Register 3 (SR3).
0 = Status Register 1 interrupt not active.
1 = Status Register 1 interrupt active.
Bit 3/Status Register 4 (SR4).
0 = Status Register 1 interrupt not active.
1 = Status Register 1 interrupt active.
Bit 4/Unused.
Bit 5/Unused.
Bit 6/Unused.
Bit 7/Unused.



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