S3C44B0X

Manufacturer Part NumberS3C44B0X
DescriptionBGA
ManufacturerSamsung
S3C44B0X datasheets
 


Specifications of S3C44B0X

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PWM TIMER
EXAMPLE OF A TIMER OPERATION
TOUTn
The result of the following procedure is shown in Figure10-4;
1. Enable the auto-reload feature. Set the TCNTBn as 160 (50+110) and the TCMPBn as 110. Set the manual
update bit and configure the inverter bit(on/off). The manual update bit sets TCNTn and TCMPn to the values of
TCNTBn and TCMPBn, respectively.
And then, set TCNTBn and TCMPBn as 80 (40+40) and 40, respectively, to determine the next reload value.
2. Set the start bit, provided that manual_update is 0 and inverter is off and auto-reload is on. The timer starts
counting down after latency time within the timer resolution.
3. When TCNTn has the same value with TCMPn, the logic level of TOUTn is changed from low to high.
4. When TCNTn reaches 0, the interrupt request is generated and TCNTBn value is loaded into a temporary
register. At the next timer tick, TCNTn is reloaded with the temporary register value(TCNTBn).
5. In the ISR(Interrupt Service Routine), the TCNTBn and TCMPBn are set as 80 (20+60) and 60, respectively,
which is used for the next duration.
6. When TCNTn has the same value as TCMPn, the logic level of TOUTn is changed from low to high.
7. When TCNTn reaches 0, TCNTn is reloaded automatically with TCNTBn. At the same time, the interrupt request
is generated.
8. In the ISR (Interrupt Service Routine), auto-reload and interrupt request are disabled to stop the timer.
9. When the value of TCNTn is same as TCMPn, the logic level of TOUTn is changed from low to high.
10. Even when TCNTn reaches to 0, TCNTn is not any more reloaded and the timer is stopped because auto-reload
has been disabled.
11. No interrupt request is generated.
10-6
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50
110
40
5
Figure 10-4. Example of a Timer Operation
S3C2400 RISC MICROPROCESSOR
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10
40
20
60
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