z8f083a ZiLOG Semiconductor, z8f083a Datasheet - Page 50
z8f083a
Manufacturer Part Number
z8f083a
Description
High-performance 8-bit Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8F083A.pdf
(256 pages)
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GPIO Alternate Functions
PS026308-1207
System
DATA
Clock
Bus
Data Register
Port Output
Many of the GPIO port pins are used for general purpose input/output and access to on-
chip peripheral functions such as the timers and serial communication devices. The Port
A–D alternate function sub-registers configure these pins for either GPIO 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–D data direction registers to the
alternate function assigned to this pin.
possible with each port pin. The alternate function associated at a pin is defined through
alternate function sub-registers AFS1 and AFS2.
The crystal oscillator functionality is not controlled by the GPIO block. When the crystal
oscillator is enabled in the oscillator control block, the GPIO functionality of PA0 and PA1
is overridden. In that case, pins PA0 and PA1 functions as input and output for the crystal
oscillator.
PA0 and PA6 contain two different timer functions, a timer input and a complementary
timer output. Both of these functions require the same GPIO configuration, the selection
between the two is based on the TIMER mode. For more details, see
D
Q
Figure 8. GPIO Port Pin Block Diagram
System
Clock
Port Output Control
Port Data Direction
Data Register
Port Input
Q
Table 14
D
on page 40 lists the alternate functions
Q
D
Z8 Encore!
General Purpose Input/Output
Schmitt Trigger
Product Specification
GND
VDD
Timers
®
F083A Series
on page 65.
Port
Pin
38
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