MC68HC05E0 Datasheet, PDF (60/96 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit

6
S
Pad
A
Y
Data Direction Register bit DDRn
(a)
DDRn A
Y
1
0
0
1
1
1
Normal operation - tri-state
0
0 tri-state
(b)
0
1 tri-state
1
0
low
1
1
---
0
0
high
0
1
high
Open drain
V_DD
VDD
Px0
DDRx, Bit0 = 0
PORTx, Bit0 = 0
DDRx, Bit0 = 1
PORTx, Bit0 = 0
(c)
Figure 6-5 Port Logic Levels
MOTOROLA
6-8
PARALLEL INPUT/OUTPUT PORTS
MC68HC05E0