pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 147
![no-image](/images/no-image-200.jpg)
pc87591l
Manufacturer Part Number
pc87591l
Description
Lpc Mobile Embedded Controllers
Manufacturer
National Semiconductor Corporation
Datasheet
1.PC87591L.pdf
(437 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PC87591L
Manufacturer:
NS
Quantity:
5 510
Company:
Part Number:
PC87591L
Manufacturer:
MOT
Quantity:
5 510
Company:
Part Number:
pc87591l-VPCN01
Manufacturer:
NSC
Quantity:
5 510
Part Number:
pc87591l-VPCN01
Manufacturer:
NS/国半
Quantity:
20 000
- Current page: 147 of 437
- Download datasheet (3Mb)
Revision 1.07
Embedded Controller Modules
4.8
The PWM module generates eight 8-bit PWM outputs; each may have a different duty cycle. A common 8-bit clock pre-scaler
and an 8-bit down-counter determine the cycle time, the minimal possible pulse width and the duty cycle steps.
4.8.1
4.8.2
The PWM generates eight 8-bit PWM outputs, PWM0 to PWM7. The Duty Cycle registers 0 to 7 (DCRi, i = 0 to 7) control
the duty cycle of PWM0 to PWM7 output signals, respectively. The Cycle Time register (CTR) controls the cycle time and
duty cycle steps of all outputs.
The PWM use the core domain clock as a reference for its activities. The pre-scaler divider divides the PWM input clock by
a pre-programmable ratio of 1:1 through 1:256, as defined by the Clock Pre-Scaler register (PRSC).
The PWM cycle is defined in terms of cycles of the pre-scaler output clock. It has a period of (CTR +1) cycles, out of which
the signal will be high for DCRi cycles. INVPi, when set, may be used to inverse this behavior.
The cycle period is defined by the 8-bit down-counter. It counts using the output clock from the pre-scaler divider, starting
from the value held in CTR register down to 0. When it reaches 0, the down-counter restarts from the CTR value.
The DCRi register defines the number of clock cycles during which PWMi signal is high during the complete down-counter
cycle.
If Inverse PWMi bit (INVPi) in PWM Polarity register (PWMPOL) is active (1), the DCRi register defines the number of clock
cycles during which PWMi signal is low in each of the down-counter complete cycles.
Figure 51 is a functional block diagram of the PWM module.
Eight PWM outputs
One 8-bit fully programmable pre-scaler
One 8-bit fully programmable down-counter
8-bit duty cycle control per output
Programmable polarity per output
Low Power mode
PULSE WIDTH MODULATOR (PWM)
Features
Functional Description
Input
Clock
PWM0
Q
R
0
S
1
Q
INVPi
Clock Pre-Scaler
8-Bit Pre-Scaler
Duty Cycle
Register 0
Compare
Register
Counter
Figure 51. PWM Block Diagram
(Continued)
Down-Counter
147
Cycle Time
Register
8-Bit
Duty Cycle
Register 7
Compare
Down-Counter == CTR
PWM7
S
Q Q
0
R
1
INVPi
www.national.com
Related parts for pc87591l
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![mma1270keg](/images/no-image3.png)
Part Number:
Description:
Freescale Semiconductor Technical Data
Manufacturer:
National Semiconductor Corporation
Datasheet:
![ADC12034](/images/no-image3.png)
Part Number:
Description:
Self-calibrating 12-bit Plus Sign Serial I/o A/d Converters With Mux And Sample/hold
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LMX2350](/images/no-image3.png)
Part Number:
Description:
Pllatinum Tm Fractional N Rf / Integer N If Dual Low Power Frequency Synthesizer
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LMX2324](/images/no-image3.png)
Part Number:
Description:
Pllatinum? 2.0 Ghz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LMX2301](/images/no-image3.png)
Part Number:
Description:
Pllatinumtm 160 Mhz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
![NDS8963](/images/no-image3.png)
Part Number:
Description:
Dual N-channel Enhancement Mode Field Effect Transistor
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM1201](/images/no-image3.png)
Part Number:
Description:
Video Amplifier System (obsolete)
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM3501TL-16](/images/no-image3.png)
Part Number:
Description:
Synchronous Step-up DC/DC Converter For White Led Applications
Manufacturer:
National Semiconductor Corporation
Datasheet:
![AD9621](/images/no-image3.png)
Part Number:
Description:
CLC420 - High Speed, Voltage Feedback op Amp, Package: Lcc, Pin Nb=20
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM2403](/images/no-image3.png)
Part Number:
Description:
Monolithic Triple 4.5 CRT Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM592M](/images/no-image3.png)
Part Number:
Description:
Differential Video Amplifier
Manufacturer:
National Semiconductor Corporation
Datasheet:
![ADC10061](/images/no-image3.png)
Part Number:
Description:
ADC10061 - 10-Bit 600 NS A/D Converter With Input Multiplexer And Sample/Hold, Package: Soic Wide, Pin Nb=20
Manufacturer:
National Semiconductor Corporation
Datasheet:
![DS36277TMX](/images/no-image3.png)
Part Number:
Description:
DS36277 - Dominant Mode Multipoint Transceiver, Package: Soic Narrow, Pin Nb=8
Manufacturer:
National Semiconductor Corporation
Datasheet:
![DS3654](/images/no-image3.png)
Part Number:
Description:
Printer Solenoid Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
![DS3662](/images/no-image3.png)
Part Number:
Description:
Quad High Speed Trapezoidal Bus Transceiver
Manufacturer:
National Semiconductor Corporation
Datasheet: