C8051F064EK Silicon Laboratories Inc, C8051F064EK Datasheet - Page 309
C8051F064EK
Manufacturer Part Number
C8051F064EK
Description
KIT EVAL FOR C8051F064
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F064EK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F06x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F064
Silicon Family Name
C8051F06x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F064
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1219
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25.2.4. Frequency Output Mode
Frequency Output Mode produces a programmable-frequency square wave on the module’s associated
CEXn pin. The capture/compare module high byte holds the number of PCA clocks to count before the out-
put is toggled. The frequency of the square wave is then defined by Equation 25.1.
Where F
The lower byte of the capture/compare module is compared to the PCA0 counter low byte; on a match,
CEXn is toggled and the offset held in the high byte is added to the matched value in PCA0CPLn. Fre-
quency Output Mode is enabled by setting the ECOMn, TOGn, and PWMn bits in the PCA0CPMn register.
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’.
Note: A value of 0x00 in the PCA0CPHn register is equal to 256 for this equation.
W
P
M
1
6
n
0
PCA0CPMn
E
C
O
M
n
C
A
P
P
n
0 0 0
C
A
P
N
n
PCA
M
A
T
n
O
G
T
n
1
W
M
P
is the frequency of the clock selected by the CPS2-0 bits in the PCA mode register, PCA0MD.
n
E
C
C
F
n
0
PCA Timebase
Enable
Equation 25.1. Square Wave Frequency Output
Figure 25.7. PCA Frequency Output Mode
Comparator
PCA0CPLn
PCA0L
8-bit
F
sqr
=
---------------------------------------- -
2 PCA0CPHn
Rev. 1.2
match
Enable
Adder
8-bit Adder
F
C8051F060/1/2/3/4/5/6/7
PCA
Toggle
TOGn
0
1
CEXn
PCA0CPHn
Crossbar
Port I/O
309
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