Z8F6421PM020SC Datasheet, PDF (72/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
52
Table 11. Port Availability by Device and Package Type (Continued)
Device
Z8X6421
Z8X6421
Z8X6422
Z8X6423
Packages
40-pin
44-pin
64- and 68-pin
80-pin
Port A
[7:0]
[7:0]
[7:0]
[7:0]
Port B
[7:0]
[7:0]
[7:0]
[7:0]
Port C
[6:0]
[7:0]
[7:0]
[7:0]
Port D Port E
[6:3, 1:0] -
[6:0]
-
[7:0] [7:0]
[7:0] [7:0]
Port F
-
-
[7]
[7:0]
Port G
-
-
[3]
[7:0]
Port H
-
-
[3:0]
[3:0]
Architecture
Figure 10 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
Port Output
Data Register
DATA
Bus
DQ
System
Clock
System
Clock
Port Output Control
VDD
Port
Pin
Port Data Direction
Figure 10. 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
PS019915-1005
General-Purpose I/O