C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 242
C8051F321
Manufacturer Part Number
C8051F321
Description
IC 8051 MCU 16K FLASH 28MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F32xr
Datasheet
1.C8051F320R.pdf
(256 pages)
Specifications of C8051F321
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
21
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 13x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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C8051F320/1
20.2.5. 8-Bit Pulse Width Modulator Mode
Each module can be used independently to generate a pulse width modulated (PWM) output on its associated CEXn
pin. The frequency of the output is dependent on the timebase for the PCA counter/timer. The duty cycle of the PWM
output signal is varied using the module's PCA0CPLn capture/compare register. When the value in the low byte of the
PCA counter/timer (PCA0L) is equal to the value in PCA0CPLn, the output on the CEXn pin will be set. When the
count value in PCA0L overflows, the CEXn output will be reset (see Figure 20.8). Also, when the counter/timer low
byte (PCA0L) overflows from 0xFF to 0x00, PCA0CPLn is reloaded automatically with the value stored in the mod-
ule’s capture/compare high byte (PCA0CPHn) without software intervention. Setting the ECOMn and PWMn bits in
the PCA0CPMn register enables 8-Bit Pulse Width Modulator mode. The duty cycle for 8-Bit PWM Mode is given
by Equation 20.2.
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’.
242
Equation 20.2. 8-Bit PWM Duty Cycle
DutyCycle
=
Rev. 1.1
(
-------------------------------------------------- -
256 PCA0CPHn
–
256
)
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