Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 58

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

36
Z8 Encore!
Product Specification
General-Purpose I/O
System Clock
GPIO Alternate Functions
Data Bus
®
Motor Control Flash MCUs
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 timers and serial communication devices. The Port
A-C Alternate Function subregisters 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-C Data Direction registers to
the alternate function assigned to this pin. For peripherals with digital input alternate func-
tions (for example, a Timer input T0IN0), selecting the alternate function is not required.
Table 13 lists the alternate functions associated with each port pin and the required alter-
nate function (AF0 and AF1) subregister settings. In general, enabling an analog alternate
Data Register
Port Output
D
System Clock
Q
Peripheral
On-Chip
Port Output Control
Port Data Direction
Figure 5. GPIO Port Pin Block Diagram
Alternate Function
Data Register
Digital Input
P R E L I M I N A R Y
Port Input
Q
D
Pull-Up Enable
Analog In/Out
Schmitt Trigger
GND
V
DD
PS024604-1005
Port
Pin