C8051F321R Silicon Laboratories Inc, C8051F321R Datasheet - Page 243

• Manufacturer Part Number: C8051F321R
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321R

• 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: -
• Other names: 336-1067-2

Using Equation 20.2, the largest duty cycle is 100% (PCA0CPHn = 0), and the smallest duty cycle is 0.39%
(PCA0CPHn = 0xFF). A 0% duty cycle may be generated by clearing the ECOMn bit to ‘0’.
PCA0CPLn
Write to
Reset
PCA0CPHn
Write to
0
ENB
ENB
1
W
P
M
1
6
n
0
O
M
E
C
n
PCA0CPMn
Figure 20.8. PCA 8-Bit PWM Mode Diagram
C
A
P
P
n
0 0 x 0
C
A
P
N
n
M
A
T
n
O
G
T
n
W
M
P
n
E
C
C
F
n
x
PCA Timebase
Enable
PCA0CPHn
Comparator
PCA0CPLn
PCA0L
8-bit
Rev. 1.1
Overflow
match
S
R
SET
CLR
Q
Q
CEXn
C8051F320/1
Crossbar
Port I/O
243