Z51F3220FNX Datasheet, PDF (29/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

6. Port Structures
6.1 General Purpose I/O Port
PULL-UP
REGISTER
OPEN DRAIN
REGISTER
DATA
REGISTER
SUB-FUNC DATA OUTPUT
SUB-FUNC ENABLE
SUB-FUNC DIRECTION
DIRECTION
REGISTER
0
MUX
1
1
MUX
0
Z51F3220
Product Specification
Level Shift (1.8V to ExtVDD)
Level Shift (ExtVDD to 1.8V)
VDD
VDD
VDD
PAD
PORTx INPUT or
SUB-FUNC DATA INPUT
CMOS or
Schmitt Level
Input
ANALOG CHANNEL
ENABLE
ANALOG INPUT
Figure 6.1 General Purpose I/O Port
PS029902-0212
PRELIMINARY
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