ST ST10F276E - Figure 54. Block Diagram of P8.4 and P8.5 Pins

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UM0404 Parallel ports
Figure 54. Block diagram of P8.4 and P8.5 pins
P8.y
Open Drain
Latch
Write ODP8.y
Read ODP8.y
Direction
Latch
Write DP8.y
Read DP8.y
Port Output
Latch
Write P8.y
Read P8.y
MUX
1
0
Output
Buffer
Input
Latch
Clock
CCzIO
Data Input
I
n
t
e
r
n
a
l
B
u
s
(y = 5, 4)
MUX
1
0
≥ 1
CCzIO
Data Output
Compare Trigger
(z = 21, 20)
CCzIO
Latch Data Input