MPC8321E Freescale Semiconductor, Inc, MPC8321E Datasheet - Page 77

• Manufacturer Part Number: MPC8321E
• Description: Mpc8321e Powerquicc Ii Pro Processor
• Manufacturer: Freescale Semiconductor, Inc

24.6
The MPC8323E provides the user with power-on configuration options which can be set through the use
of external pull-up or pull-down resistors of 4.7 kΩ on certain output pins (see customer visible
configuration pins). These pins are generally used as output only pins in normal operation.
While HRESET is asserted however, these pins are treated as inputs. The value presented on these pins
while HRESET is asserted, is latched when HRESET deasserts, at which time the input receiver is disabled
and the I/O circuit takes on its normal function. Careful board layout with stubless connections to these
pull-up/pull-down resistors coupled with the large value of the pull-up/pull-down resistor should minimize
the disruption of signal quality or speed for output pins thus configured.
24.7
The MPC8323E requires high resistance pull-up resistors (10 kΩ is recommended) on open drain type pins
including I
For more information on required pull-up resistors and the connections required for the JTAG interface,
see AN3361, MPC8321E/MPC8323E PowerQUICC™ Design Checklist, Rev. 1.
25 Document Revision History
Table 66
Freescale Semiconductor
Rev.
No.
MPC8323E PowerQUICC™ II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 1
0
1
provides a revision history for this hardware specification.
06/2007
06/2007
Configuration Pin Multiplexing
Pull-Up Resistor Requirements
Date
2
C pins, Ethernet Management MDIO pin, and IPIC interrupt pins.
Initial release.
Correction to descriptive text in Section 2.2.
Table 66. Document Revision History
Substantive Change(s)
Document Revision History
77