HT95L100/10P

Rev. 0.10

21

October 1, 2002

Preliminary

Phone controller also supports the dialer I/O flag to monitor the dialer status.

Register

Label

Bits

R/W

Function

DIALERIO

(16H)

HFI

0

RO

1: The HFI pin level is 1.

0: The HFI pin level is 0.

HFO

1

RO

1: The HFO pin level is 1.

0: The HFO pin level is 0.

HDI

2RO

1: The HDI pin level is 1.

0: The HDI pin level is 0.

HDO

3

RO

1: The HDO pin level is 1.

0: The HDO pin level is 0.

HKS

4RO

1: The HKS pin level is 1.

0: The HKS pin level is 0.

SPO

5

RW

1: The PO pin is controlled by the combination of the HKS, HFI and HDI pin.

0: The PO pin level is set to 0 by software.

SDNPO

6

RW

1: The DNPO pin level is set to floating by software.

0: The DNPO pin level is set to 0 by software.

XMUTE

7RW

1: The XMUTE pin is set to floating by software.

0: The XMUTE pin is set to 0 by software.

The SPO flag is special designed to control the PO. When the flag SPO is set to 1, the PO pin is controlled by the combi-

nation of the HKS pin, HFI pin and HDI pin. The PO pin will always be 0 if the flag SPO=0.

The relation between the Dialer I/O function (SPO=1)

Dialer Function

Dialer I/O Pin (Flag) Status

Result

HKS

HFO

HDO

PO

DNPO

Telephone Line

On-hook

1000

floating

break

On-hook & Hand-free

1101

floating

make

On-hook & Hold-line

1011

floating

make

Off-hook

0001

floating

make

Off-hook & Hand-free

0101

floating

make

Off-hook & Hold-line

0011

floating

make

The following describes the dialer I/O function status machine figure:

O n - h o o k

O f f - h o o k

O n - h o o k

H . I

H . I H D I

H . I

H D I

O f f - h o o k

O n - h o o k

H D I

H . I

O f f - h o o k

H D I

O f f - h o o k

H a n d - f r e e

O n - h o o k

H a n d - f r e e

O f f - h o o k

H o l d - l i n e

O n - h o o k

H o l d - l i n e

O n - h o o k

O f f - h o o k

H D I

Off-hook: A falling edge to HKS pin

On-hook: A rising edge to HKS pin

HFI: A high pulse to HFI pin (Hand-free request is generated.)

HDI: A low pulse to HDI pin (Hold-line request is generated.)