z8f1621 ZiLOG Semiconductor, z8f1621 Datasheet - Page 68

• Manufacturer Part Number: z8f1621
• Description: High Performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

GPIO Alternate Functions
PS019921-0308
System
DATA
Clock
Bus
Data Register
Port Output
Many of the GPIO port pins can be used as both general-purpose I/O and to provide access
to on-chip peripheral functions such as the timers and serial communication devices. The
Port A–H Alternate Function sub-registers configure these pins for either general-purpose
I/O or alternate function operation. When a pin is configured for alternate function, control
of the port pin direction (input/output) is passed from the Port A–H Data Direction regis-
ters to the alternate function assigned to this pin.
associated with each port pin.
D
Q
Figure 9. GPIO Port Pin Block Diagram
System
Clock
Port Output Control
Port Data Direction
Data Register
Port Input
Q
D
Table 12
Z8 Encore! XP
lists the alternate functions
Schmitt-Trigger
Product Specification
GND
VDD
General-Purpose I/O
®
F64XX Series
Port
Pin
54