C8051T322-GQR Silicon Labs, C8051T322-GQR Datasheet - Page 264

• Manufacturer Part Number: C8051T322-GQR
• Description: 8-bit Microcontrollers - MCU USB-OTP-16K-LQFP32
• Manufacturer: Silicon Labs

Specifications of C8051T322-GQR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

C8051T620/621/320/321/322/323
29.2. PCA0 Interrupt Sources
Figure 29.3 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 over-
flow from the 8th, 9th, 10th, or 11th bit of the PCA0 counter, and the individual flags for each PCA channel
(CCF0, CCF1, CCF2, CCF3, and CCF4), 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.
264
SYSCLK/12
SYSCLK/4
Timer 0 Overflow
ECI
SYSCLK
External Clock/8
C
D
L
I
W
D
E
T
PCA0MD
W
D
C
K
L
C
P
S
2
000
001
010
011
100
101
C
P
S
1
C
P
S
0
C
E
F
Figure 29.2. PCA Counter/Timer Block Diagram
IDLE
C
F
C
R
PCA0CN
C
C
F
4
C
C
F
3
C
C
F
2
C
C
F
1
C
C
F
0
Rev. 1.1
0
1
PCA0L
read
Snapshot
Register
PCA0H
PCA0L
To SFR Bus
To PCA Modules
Overflow
CF
To PCA Interrupt System