Silicon Laboratories SI2494/39, SI2493/57/34/15/04 manual U70 Bit Map

AN93

Table 73. U70 Bit Map

Bit

Name

Function

15

HES

Enable Hardware Escape Pin.

0

= Disable.

1

= Enable.

14

Reserved

Read returns zero.

13

TES

Enable Escape (+++).

0

= Disable.

1

= Enable.

12

CIDM

Caller ID Mask.

0

= Change in CID does not affect

INT

.

1

= CID low-to-high transition triggers INT.

11

OCDM

Overcurrent Detect Mask.

0

= Change in OCD does not affect INT.

(“X” result code is not generated in command mode.)

1

= OCD low-to-high transition triggers INT.

(“X” result code is generated in command mode.)

10

PPDM

Parallel Phone Detect Mask.

0

= Change in PPD does not affect

INT.

1

= PPD low-to-high transition triggers

INT.

9

RIM

Ring Indicator Mask.

0

= Change in RI does not affect

INT.

1

= RI low-to-high transition triggers

INT.

8

DCDM

Data Carrier Detect Mask.

0

= Change in DCD (U70, bit 0) does not affect

INT.

1

= DCD high-to-low transition triggers INT.

7:5

Reserved

Read returns zero.

4

CID

Caller ID (sticky).

1

= Caller ID preamble detected; data to follow. Clears on :I read.

3

OCD

Overcurrent Detect (sticky).

1

= Overcurrent condition has occurred. Clears on :I read.

2

PPD

Parallel Phone Detect (sticky).

1

= Parallel phone detected since last off-hook event. Clears on :I read.

1

RI

Ring Indicator (sticky).

1

= Ring event has occurred (ISOmodem on-hook). Clears on :I read.

0

DCD

Data Carrier Detect (status).

1

= carrier detected (inverse of

DCD

pin).

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