Z8F1601 Datasheet, PDF (52/246 Pages) Zilog, Inc. – Z8 Encore Microcontrollers with Flash Memory and 10-Bit A/D Converter

Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
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34
Table 10. Port Availability by Device and Package Type (Continued)
Device
Z8F6401
Z8F6402
Z8F6403
Packages
44-pin
64- and 68-pin
80-pin
Port A
[7:0]
[7:0]
[7:0]
Port B
[7:0]
[7:0]
[7:0]
Port C
[7:0]
[7:0]
[7:0]
Port D
[6:0]
[7:0]
[7:0]
Port E
-
[7:0]
[7:0]
Port F
-
[7]
[7:0]
Port G
-
[3]
[7:0]
Port H
-
[3:0]
[3:0]
Architecture
Figure 64 illustrates a simplified block diagram of a GPIO port pin. In this figure, the abil-
ity to accommodate alternate functions and variable port current drive strength are not
illustrated.
Port Input
Data Register
QD
Schmitt Trigger
QD
Port Output
Data Register
DATA
Bus
DQ
System
Clock
System
Clock
Port Output Control
VDD
Port
Pin
Port Data Direction
Figure 64. GPIO Port Pin Block Diagram
GND
GPIO Alternate Functions
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
PS017610-0404
General-Purpose I/O