MC97F6108A User’s manual
3. Port structures
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3
Port structures
In this chapter, two port structures are introduced in figures 1, 2 and 3 regarding general purpose I/O
port and external interrupt I/O port respectively.
DATA
REGISTER
DIRECTION
REGISTER
PORTx INPUT
PAD
VDD
VDD
Schmitt Level
Input
Level Shift (1.8V to ExtVDD)
Level Shift (ExtVDD to 1.8V)
VDD
MUX
1
0
PULL-UP
REGISTER
VDD
OPEN-DRAIN
REGISTER
Figure 4. General Purpose I/O Port