C8051F336DK Silicon Laboratories Inc, C8051F336DK Datasheet - Page 212
![DEV KIT FOR C8051F336](/photos/9/23/92341/c8051f336dk_sml.jpg)
C8051F336DK
Manufacturer Part Number
C8051F336DK
Description
DEV KIT FOR C8051F336
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F336DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F33x
Interface Type
USB, UART
Operating Supply Voltage
7 V to 15 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F336
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1430
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C8051F336/7/8/9
25.3.6. 16-Bit Pulse Width Modulator Mode
A PCA module may also be operated in 16-Bit PWM mode. 16-bit PWM mode is independent of the other
(8/9/10/11-bit) PWM modes. In this mode, the 16-bit capture/compare module defines the number of PCA
clocks for the low time of the PWM signal. When the PCA counter matches the module contents, the out-
put on CEXn is asserted high; when the 16-bit counter overflows, CEXn is asserted low. To output a vary-
ing duty cycle, new value writes should be synchronized with PCA CCFn match interrupts. 16-Bit PWM
Mode is enabled by setting the ECOMn, PWMn, and PWM16n bits in the PCA0CPMn register. For a vary-
ing duty cycle, match interrupts should be enabled (ECCFn = 1 AND MATn = 1) to help synchronize the
capture/compare register writes. If the MATn bit is set to 1, the CCFn flag for the module will be set each
time a 16-bit comparator match (rising edge) occurs. The CF flag in PCA0CN can be used to detect the
overflow (falling edge). The duty cycle for 16-Bit PWM Mode is given by Equation 25.4.
Important Note About Capture/Compare Registers: When writing a 16-bit value to the PCA0 Cap-
ture/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 25.4, 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.
212
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 25.4. 16-Bit PWM Duty Cycle
W
M
P
n
Figure 25.10. PCA 16-Bit PWM Mode
E
C
C
F
n
x
Duty Cycle
Enable
PCA0CPHn
PCA0H
=
16-bit Comparator
(
---------------------------------------------------- -
Rev.1.0
65536 PCA0CPn
PCA0CPLn
PCA0L
–
65536
Overflow
match
)
S
R
SET
CLR
Q
Q
CEXn
Crossbar
Port I/O
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