Motorola MC6805R Series - Page 91

Port COpen-Drain
Option (MC6805U2/R2,
MC6805U3/R3
Only)
"
PortDDR
Port
Data
IP= Input Protection
~
VDD
PortA CMOS
k' Pullup Option
I
Figure 11-16. Ports A and C Logic Diagram
PAD ~....A,}V'v--""---"To I/O Logic
Figure 11-18. Typical Input Protection
VDD
1-10 k Typ.
PB DDR
PB Data
IP= Input Protection
Figure 11-17. Port B Logic Diagram
V
Vary V,
Measure I
Figure 11-19. I/O Characteristic
Measurement Circuit
11-19/11-20