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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
22.2.3. High Speed Output Mode
In High Speed Output mode, a module's associated CEXn pin is toggled each time a match occurs
between the PCA Counter and the module's 16-bit capture/compare register (PCA0CPHn and
PCA0CPLn) Setting the TOGn, MATn, and ECOMn bits in the PCA0CPMn register enables the
High-Speed Output 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'.
Write to
PCA0CPLn
0
ENB
Reset
Write to
PCA0CPHn
ENB
1
Enable
PCA
Timebase
Figure 22.6. PCA High Speed Output Mode Diagram
260
PCA0CPMn
P
P
E
C
C
M
T
E
W
W
C
A
A
A
O
C
M
M
O
P
P
T
G
C
1
n
M
P
N
n
n
F
6
n
n
n
n
n
x
0 0
0 x
PCA0CPLn
PCA0CPHn
16-bit Comparator
PCA0L
PCA0H
Rev. 1.3
PCA Interrupt
PCA0CN
C
C
C
C
C
C
C
F
R
C
C
C
C
C
F
F
F
F
F
4
3
2
1
0
0
Match
1
TOGn
Toggle
0
CEXn
Crossbar
1
Port I/O
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