T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
14 Comparators (continued)
14.1 Comparators Register Set (continued)
Table 115. CMIR: Comparator Interrupt Register (0x4E)
Reg
R/W
Bit 7
—
Bit 6
CMV.2
—
Bit 5
CMV.1
—
Bit 4
CMV.0
—
Bit 3
—
Bit 2
CMI.2
—
Bit 1
CMI.1
—
Bit 0
CMI.0
—
CMIR
R
RESET Default
—
—
Note: Bits CMI.[2:0] in this register are set to 1 upon occurrence of the corresponding interrupt condition, and are
cleared to 0 when the register is read.
Bit #
7
Symbol
Name/Description
—
Reserved.
6—4
Comparator [2:0] Value. These status bits indicate the current state of the correspond-
ing comparator output. No interrupt is generated in response to the value in these bits.
CMV.[2:0]
3
—
Reserved.
2—0
Comparator [2:0] Interrupt. This interrupt indicates that the comparator output has tog-
gled in the direction specified in register CMT.
CMI.[2:0]
Table 116. CMIE: Comparator Interrupt Enable (0x4F)
Reg
R/W
Bit 7
—
Bit 6
CMV.2
—
Bit 5
CMV.1
—
Bit 4
CMV.0
—
Bit 3
—
Bit 2
CMIE.2
0
Bit 1
CMIE.1
0
Bit 0
CMIE.0
0
CMIE
R/W
RESET Default
0
0
Bit #
7
Symbol
Name/Description
—
Reserved. Program to 0.
6—4
Comparator [2:0] Value (Read-Only Field). These status bits indicate the current state
of the corresponding comparator output.
CMV.[2:0]
3
—
Reserved. Program to 0.
2—0
CMIE.[2:0]
Comparator [2:0] Interrupt Enable.
0: Interrupt disabled (masked).
1: Interrupt enabled.
Masked interrupts are not latched.
14.2 Configuration Sequence
In order to avoid unwanted interrupts when changing the CMT value, the user should satisfy at least one of the fol-
lowing two conditions:
■ The comparator interrupt is disabled.
■ The comparator is powered down.
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