HPC16064 Datasheet, PDF (12/36 Pages) National Semiconductor (TI) – High-Performance microController

Connection Diagrams (Continued)
Pin Grid Array Pinout
TL DD 11372 34
Top View
(looking down on component side of PC Board)
Order Number HPC16064XXX U20 HPC16064XXX U30 HPC16004U20 or HPC16004U30
See NS Package Number U68A
Note XXX designates the unique ROM code of a masked device
Ports A B
The highly flexible A and B ports are similarly structured
The Port A (see Figure 11 ) consists of a data register and a
direction register Port B (see Figures 12 13 and 14 ) has an
alternate function register in addition to the data and direc-
tion registers All the control registers are read write regis-
ters
The associated direction registers allow the port pins to be
individually programmed as inputs or outputs Port pins se-
lected as inputs are placed in a TRI-STATE mode by reset-
ting corresponding bits in the direction register
A write operation to a port pin configured as an input causes
the value to be written into the data register a read opera-
tion returns the value of the pin Writing to port pins config-
ured as outputs causes the pins to have the same value
reading the pins returns the value of the data register
Primary and secondary functions are multiplexed onto Port
B through the alternate function register (BFUN) The sec-
ondary functions are enabled by setting the corresponding
bits in the BFUN register
12