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MFC2000 데이터시트(PDF) 359 Page - List of Unclassifed Manufacturers

부품명 MFC2000
상세설명  Multifunctional Peripheral Controller 2000
PDF  426 Pages
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제조업체  ETC [List of Unclassifed Manufacturers]
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MFC2000 데이터시트(HTML) 359 Page - List of Unclassifed Manufacturers

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Multifunctional Peripheral Controller 2000
MFC2000
100723A
Conexant
20-1
20. Programmable Tone Generators
20.1 Introduction
The AMFPC provides three programmable clock generator outputs. Two of the generators are to be used as tone
generators and the third as a bell or ring driver.
20.2 Bell/Ringer Generator
The frequency of this bell/ringer generator is programmable, ranging from 500 Hz to 15.6 Hz. This frequency is
derived from the AMFPC’s internal 125
µs period Clock, and it is calculated based on the following formula:
OutputFrequency
s
BellPeriod
=
×+ ×
1
125
1
16
µ ()
, where BellPeriod is ranging from 0 to 31.
Each bell/ringer period is divided into 16 phases, as shown in the following figure. The phase number may be
used by the firmware to determine when to turn off bell signal.
0F
E
D
C
B
A
987654
3
210
F
1
Hi-Z
Hi-Z
Hi-Z
Phase:
Bell Mode:
Ringer Mode:
Modulated b y ALTTone Generator
E
period
50% x period
50% x period
Figure 20-1. Bell/Ringer Timing
The mode of operation for this bell/ringer generator is selected by RingerEnb bit in BellControl register.
Figure 20-2 shows the block diagram of this bell/ringer generator.
Table 20-1shows the relationship between BellPeriod value and output frequency.



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