C8051F709-GQR Silicon Labs, C8051F709-GQR Datasheet - Page 289
C8051F709-GQR
Manufacturer Part Number
C8051F709-GQR
Description
8-bit Microcontrollers - MCU 8kB 32B EEPROM Cap Sense
Manufacturer
Silicon Labs
Datasheet
1.C8051F709-GQR.pdf
(306 pages)
Specifications of C8051F709-GQR
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
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Part Number:
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34.3.2. 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. An interrupt request is generated if the CCFn interrupt for that module is
enabled. The CCFn bit is not automatically cleared by hardware when the CPU vectors to the interrupt ser-
vice routine, and must be cleared by software. Setting the ECOMn and MATn bits in the PCA0CPMn regis-
ter enables Software Timer mode.
Important Note About Capture/Compare Registers: When writing a 16-bit value to the PCA0 Cap-
ture/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
ENB
ENB
1
W
M
P
1
6
n
Figure 34.5. PCA Software Timer Mode Diagram
x
E
C
O
M
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
M
P
n
C
C
E
F
n
x
Enable
PCA
Timebase
Rev. 1.0
PCA0CPLn
PCA0L
16-bit Comparator
PCA0CPHn
PCA0H
C8051F70x/71x
Match
C
F
C
R
PCA0CN
0
1
C
C
F
2
C
C
F
1
C
C
F
0
PCA Interrupt
289
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