C8051F320 Silicon Laboratories Inc, C8051F320 Datasheet - Page 241

• Manufacturer Part Number: C8051F320
• Description: IC 8051 MCU 16K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F320

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 25
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 17x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

20.2.4. 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 output is toggled. The
frequency of the square wave is then defined by Equation 20.1.
Where F
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 register.
Note: A value of 0x00 in the PCA0CPHn register is equal to 256 for this equation.
PCA0CPLn
Write to
Reset
PCA
PCA0CPHn
Write to
is the frequency of the clock selected by the CPS2-0 bits in the PCA mode register, PCA0MD. The
0
1
ENB
ENB
Equation 20.1. Square Wave Frequency Output
W
P
M
1
6
n
x
Figure 20.7. PCA Frequency Output Mode
E
C
O
M
n
PCA0CPMn
C
A
P
P
n
0 0 0
C
N
A
P
n
M
A
T
n
O
G
T
n
W
P
M
n
C
C
E
F
n
x
PCA Timebase
F
CEXn
Enable
=
Comparator
PCA0CPLn
---------------------------------------- -
2
PCA0L
×
8-bit
Rev. 1.1
PCA0CPHn
F
PCA
match
Enable
Adder
8-bit Adder
Toggle
TOGn
0
1
CEXn
C8051F320/1
PCA0CPHn
Crossbar
Port I/O
241