MFC2000 datasheet(362/426 Pages) ETC

362 / 426 page

MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

20-4

Conexant

100723A

To setup for Ringer mode, the following steps must be taken:

Initialize:

Write the desired frequency of bell in BellPeriod register (see Table 20-1)

Enable output drive (BellDriveEnb = 1, will over-ride Hi Z control)

Enable ringer mode (RingerEnb = 1)

Write the desired frequency of tone1 in ALTToneGen register

If ALTTone signal is not desired on the ALTTone pin, then disable ALTTone signal to the pin

(ALTToneEnb = 0).

Note: ALTToneEnb is only to enable the ALTTone signal to the ALTTone pin. If ALTToneEnb =

0, ALTTone signal will be blocked to ALTTone pin, but ALTTone signal is still available to

Bell/Ringer generator for modulation purpose.

Start ringer signal:

Enable Bell generator (BellEnb = 1)

(This setting will start the counter to run)

Create “Ring-Quiet-Ring” signal:

The firmware can generate the signal by switching the BellEnb setting.

20.2.3 Registers Description

The following is a description of the registers used to control the Bell/Ringer Function.

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

BellPeriod

01FF80B7

(Not Used)

Rst. Value

xxh

Read Value

00h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

BellPeriod

01FF80B6

(Not Used)

Bell Period (0 - 31), bell period = (BellPeriod+1)*2ms

Rst. Value

xxx00000b

Read Value

00h

Bit 15-5:

Not Used

Bit 4-0:

Writing to this register will set the Bell Period. Reading this register will

return that value.

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