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M4640-19 View Datasheet(PDF) - Conexant Systems

Part NameDescriptionManufacturer
M4640-19 Baseband Processor for GSM Applications Conexant
Conexant Systems Conexant
M4640-19 Datasheet PDF : 47 Pages
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Baseband Processor
Battery Voltage
M46
PWM 1
PWM 2
Toggle
Switch
(1.95 MHz)
Buzzer
C044
Figure 8. Annunciator Output Circuitry and Buzzer Driving Circuitry
1.95 MHz Clock
Enable
8 Bit Counter
[0...99]
Counter Register
Duty Cycle Register
(8 bits)
Clock Divider
Comparator
Data Pattern Shift
Register
(32 bits)
Mod
Tone
PWM Output
Clock Divider
Register
(10 bits)
Data Pattern Latch
(32 bits)
Note : The shaded blocks are programmable
C045
Figure 9. PWM Functional Block Diagram
The counter circuit is an 8-bit counter that is clocked at 3.9 MHz.
The counter counts to the value set in the Counter Register and
is then reset to 0. The default value of the Counter Register is
decimal 100.The Duty Cycle Register is a programmable 8-bit
register. The duty cycle for Mod is written to this register. The
comparator function compares the counter output with the value
of the Duty Cycle Register. The output from the comparator is
determined by the following rule:
If Counter Value Duty Cycle Register, Comparator Output =
1,
Else Comparator Output = 0
The output from the comparator is the Mod signal. The duty
cycle of the Mod signal is programmable by writing to the Duty
Cycle Register and to the Counter Register. If the Counter
Register default value is used (decimal 100) the frequency of
the Mod signal is 39 kHz (3.9 MHz/100).
An example of the generation of the Mod signal is shown in
Figure 10. In this example the Counter Register default value of
100 is used.
100779C
Conexant
Proprietary Information and Specifications are Subject to Change
27
June 14, 2000
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