C8051F310-TB Silicon Laboratories Inc, C8051F310-TB Datasheet - Page 211
C8051F310-TB
Manufacturer Part Number
C8051F310-TB
Description
BOARD PROTOTYPING W/C8051F310
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F310-TB
Contents
Board
Processor To Be Evaluated
C8051F31x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F310
Silicon Family Name
C8051F31x
Kit Contents
Board
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F310
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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18.2.6. 16-Bit Pulse Width Modulator Mode
A PCA module may also be operated in 16-Bit PWM mode. In this mode, the 16-bit capture/compare mod-
ule defines the number of PCA clocks for the low time of the PWM signal. When the PCA counter matches
the module contents, the output on CEXn is asserted high; when the counter overflows, CEXn is asserted
low. To output a varying duty cycle, new value writes should be synchronized with PCA CCFn match inter-
rupts. 16-Bit PWM Mode is enabled by setting the ECOMn, PWMn, and PWM16n bits in the PCA0CPMn
register. For a varying duty cycle, match interrupts should be enabled (ECCFn = 1 AND MATn = 1) to help
synchronize the capture/compare register writes. The duty cycle for 16-Bit PWM Mode is given by
Equation 18.3.
Important Note About Capture/Compare Registers: When writing a 16-bit value to the PCA0 Capture/
Compare registers, the low byte should always be written first. Writing to PCA0CPLn clears the ECOMn bit
to ‘0’; writing to PCA0CPHn sets ECOMn to ‘1’.
Using Equation 18.3, the largest duty cycle is 100% (PCA0CPn = 0), and the smallest duty cycle is
0.0015% (PCA0CPn = 0xFFFF). A 0% duty cycle may be generated by clearing the ECOMn bit to ‘0’.
PCA0CPLn
Write to
Reset
PCA0CPHn
Write to
0
ENB
ENB
1
W
M
P
1
6
n
1
O
M
E
C
n
PCA0CPMn
C
A
P
P
n
0 0 x 0
C
A
P
N
n
M
A
T
n
PCA Timebase
O
G
T
n
Equation 18.3. 16-Bit PWM Duty Cycle
W
M
P
n
E
C
C
F
n
x
Figure 18.9. PCA 16-Bit PWM Mode
DutyCycle
Enable
PCA0CPHn
PCA0H
=
16-bit Comparator
Rev. 1.7
---------------------------------------------------- -
65536 PCA0CPn
PCA0CPLn
PCA0L
C8051F310/1/2/3/4/5/6/7
–
65536
Overflow
match
S
R
SET
CLR
Q
Q
CEXn
Crossbar
Port I/O
211
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