C8051F980-C-GM Datasheet, PDF (302/325 Pages) Silicon Laboratories – Ultra Low Power, 8-2 kB Flash, Capacitive Sensing MCU

C8051F99x-C8051F98x
26.2. PCA0 Interrupt Sources
Figure 26.3 shows a diagram of the PCA interrupt tree. There are five independent event flags that can be
used to generate a PCA0 interrupt. They are: the main PCA counter overflow flag (CF), which is set upon
a 16-bit overflow of the PCA0 counter, an intermediate overflow flag (COVF), which can be set on an
overflow from the 8th, 9th, 10th, or 11th bit of the PCA0 counter, and the individual flags for each PCA
channel (CCF0, CCF1, and CCF2), which are set according to the operation mode of that module. These
event flags are always set when the trigger condition occurs. Each of these flags can be individually
selected to generate a PCA0 interrupt, using the corresponding interrupt enable flag (ECF for CF, ECOV
for COVF, and ECCFn for each CCFn). PCA0 interrupts must be globally enabled before any individual
interrupt sources are recognized by the processor. PCA0 interrupts are globally enabled by setting the EA
bit and the EPCA0 bit to logic 1.
(for n = 0 to 2)
PCA0CPMn
PECCMT PE
WC A A A O WC
MO P P T GMC
1 MPN n n n F
6nnn
n
n
PCA Counter/Timer 8, 9,
10 or 11-bit Overflow
PCA Counter/Timer 16-
bit Overflow
PCA Module 0
(CCF0)
PCA0CN
CC
CCC
FR
CCC
FFF
210
PCA0MD
C WW C C C E
I DD PPPC
DTL SSSF
LEC 2 1 0
K
ECCF0
0
1
0
1
PCA Module 1
(CCF1)
ECCF1
0
1
PCA Module 2
(CCF2)
ECCF2
0
1
PCA0PWM
AEC
CC
RCO
LL
SOV
SS
EVF
EE
L
LL
10
Set 8, 9, 10, or 11 bit Operation
0
1
EPCA0
EA
0
1
Figure 26.3. PCA Interrupt Block Diagram
0 Interrupt
Priority
1
Decoder
302
Rev. 1.2