Reset Behaviour Of Gpio Ports And External Bus - Fujitsu ALL FR 460 Series Application Note

5 Reset Behaviour of GPIO ports and external bus

THIS CHAPTER SHOWS THE BEHAVIOUR OF IO-PORT DURING AND AFTER RESET
During the power-on or INITX reset state the GPIO port pins are going to HiZ and the inputs
are disabled to prevent the leakage by any floating pin. After release of reset the IO-ports will
be set to initial value (see related DS of MB91460 series)
Note: For some MCU derivates (e.g. MB91F467D or MB91F469G) with external bus interface
the external bus function will be set by reset, independents on internal or external mode vector
fetch. In case of single chip mode the external bus function is active until any user program
overwrites the related PFR's from external bus to GPIO function. The initial values of external
bus are configured as following:
GPIO
P00-P03
P04-P07
P08-P10
P10_4
P10_5
MONCLK
P11-P35
Note: If the external bus pins should be used as GPIO function the address and bus control
lines are driven as output at high level directly after the reset initialization.
MCU-AN-300033-E-V15
FR460 Hardware Set Up
Chapter 5 Reset Behaviour of GPIO ports and external bus
XBUS
D0-D31
A0-A31
Bus control
MCLKO
MCLKI
MONCLK
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Initial function Initial state
XBUS
XBUS
XBUS
XBUS Output CLKT
XBUS
XBUS
GPIO
© Fujitsu Microelectronics Europe GmbH
Input HiZ
Output high
Output high
Input
Output HiZ
Input HiZ