mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 931

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

16.14.4 Port A Example Configurations
The port A pins can be configured in many ways. PA15 can be configured as a
general-purpose I/O pin, but not an open-drain pin. It can also be the USBRXD pin for the
USB. If it is configured as a general-purpose I/O pin, the USBRXD input is internally
grounded. Figure 16-131 and Figure 16-132 illustrate the block diagrams of the PA15 and
PA14 pins.
PA14 can be configured as a general-purpose I/O pin, either open-drain or not. It can also
be the USBOE pin for the USB. If USBTXD is configured as an output on PA14 and the
OD14 bit is set in the PAODR, then USBTXD is output from the USB as an open-drain
output. If PA14 is configured as a general-purpose I/O pin, then the USBTXD output is not
externally connected.
USB
TO
PADAT
BIT 15
TO
USBRXD
OUTPUT
LATCH
Figure 16-131. Parallel Block Diagram For PA15
MUX
EN
Freescale Semiconductor, Inc.
For More Information On This Product,
0
1
EN
MPC823 REFERENCE MANUAL
16 BITS
PADIR
Go to: www.freescale.com
0
1
MUX
EN
EN
16 BITS
PAPAR
0
1
Communication Processor Module
MUX
EN
USBRXD/PA15
PIN
16-479