C8051F700-GQR Silicon Laboratories Inc, C8051F700-GQR Datasheet - Page 291
C8051F700-GQR
Manufacturer Part Number
C8051F700-GQR
Description
MCU 8-Bit C8051F70x 8051 CISC 15KB Flash 1.8V/3V 64-Pin TQFP T/R
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F700DK.pdf
(306 pages)
Specifications of C8051F700-GQR
Package
64TQFP
Device Core
8051
Family Name
C8051F70x
Maximum Speed
25 MHz
Ram Size
512 Byte
Program Memory Size
15 KB
Operating Supply Voltage
1.8|3 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
54
Interface Type
I2C/SMBus/SPI/UART
On-chip Adc
16-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
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34.3.4. 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 34.1.
Where F
PCA0MD. The lower byte of the capture/compare module is compared to the PCA 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.
Frequency Output Mode is enabled by setting the ECOMn, TOGn, and PWMn bits in the PCA0CPMn reg-
ister. The MATn bit should normally be set to 0 in this mode. If the MATn bit is set to 1, the CCFn flag for
the channel will be set when the 16-bit PCA0 counter and the 16-bit capture/compare register for the chan-
nel are equal.
Note: A value of 0x00 in the PCA0CPHn register is equal to 256 for this equation.
PCA0CPLn
Write to
Reset
PCA0CPHn
PCA
Write to
is the frequency of the clock selected by the CPS2–0 bits in the PCA mode register,
0
ENB
ENB
1
Equation 34.1. Square Wave Frequency Output
W
M
P
1
6
n
x
C
O
M
E
n
Figure 34.7. PCA Frequency Output Mode
PCA0CPMn
C
A
P
P
n
0 0 0
C
A
P
N
n
M
A
T
n
T
O
G
n
W
P
M
n
C
C
E
F
n
x
PCA Timebase
F
CEXn
Enable
=
Rev. 1.0
---------------------------------------- -
2
Comparator
PCA0CPLn
PCA0L
8-bit
PCA0CPHn
F
PCA
match
Enable
Adder
8-bit Adder
Toggle
C8051F70x/71x
TOGn
0
1
CEXn
PCA0CPHn
Crossbar
Port I/O
291
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