C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 239
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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20.2.2. Software Timer (Compare) Mode
In Software Timer mode, the PCA counter/timer value is compared to the module's 16-bit capture/compare register
(PCA0CPHn and PCA0CPLn). When a match occurs, the Capture/Compare Flag (CCFn) in PCA0CN is set to
logic 1 and an interrupt request is generated if CCF interrupts are enabled. The CCFn bit is not automatically cleared
by hardware when the CPU vectors to the interrupt service routine, and must be cleared by software. Setting the
ECOMn and MATn bits in the PCA0CPMn register enables Software Timer mode.
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’.
PCA0CPLn
Write to
Reset
PCA0CPHn
Write to
0
1
ENB
ENB
Figure 20.5. PCA Software Timer Mode Diagram
W
M
P
1
6
n
x
C
O
M
E
n
PCA0CPMn
C
A
P
P
n
0 0
C
A
P
N
n
M
A
T
n
O
G
T
n
0 0
W
P
M
n
E
C
C
F
n
x
Enable
PCA
Timebase
PCA0CPLn
PCA0L
Rev. 1.1
16-bit Comparator
PCA0CPHn
PCA0H
Match
C8051F320/1
C
F
C
R
PCA0CN
0
1
C
C
F
4
C
C
F
3
C
C
F
2
C
C
F
1
PCA Interrupt
C
C
F
0
239
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