Fujitsu MB96300 series Hardware Manual page 351

MB96300 Super Series Hardware Manual
used for xxx output
(if enabled in Exxx)
xxx input function
Hi-Z
If another state than Hi-Z should be used for output pins during Hold state or external bus access pause, set
the DDR to output and write the required value to the PDR register of the corresponding pin. When the
external bus disables its output enable of these pins to change the pin state to Hi-Z, the PDR value is output
to the pin instead.
Note: Pull-up resistors can also be used to terminate the pin state when they are not driven by the external
bus module.
• The pin can be used as external bus output signal.
• The output of the external bus function can be enabled/disabled
with the corresponding output enable bit in the Exxx register.
• If the pin is used as external bus output, another output resource
sharing the same pin must be disabled.
• If the pin is used as external bus output and the Hold function
should be used, set the corresponding DDR to input. Otherwise
the PDR value will be output in Hold state instead of Hi-Z.
• If the pin is not used as external bus output, it can be used as port
pin or output of another resource. The Hold function has no
effect in this case.
• The pin can be used as external bus input pin.
• The corresponding input must be enabled by setting PIER to '1'.
• Another output resource sharing the same pin must be disabled.
• The corresponding DDR must be set to '0' (input).
• The corresponding DDR must be set to 'input' for Hi-Z. As for
all used external bus output pins, other resources sharing the
same pin must be disabled.
• If DDR is set to output, the value defined in the corresponding
PDR register is output instead of Hi-Z.
CHAPTER 12 EXTERNAL BUS INTERFACE
343