ST ST10F276E - Figure 39. Block Diagram of Port4 Pins 3

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UM0404 Parallel ports
Figure 39. Block diagram of Port4 pins 3...0
Direction
Latch
Write DP4.y
Read DP4.y
Port Output
Latch
Write P4.y
Read P4.y
Internal Bus
MUX
0
1
MUX
0
1
Ext. Memory
Data
Output
MUX
0
1
“1”
Input
Latch
Clock
P4.y
Output
Buffer
y = 3...0
Ext. Memory
Function
Enable