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CHAPTER 23 LOCAL BUS INTERFACE FUNCTIONS
User’s Manual U12697EJ3V0UM
23.6 External Access Status Output Function
23.6.1 Summary
The external access status signal is output from the P37/EXA pin. This signal is output at the moment of external
access when use of the external bus interface function has been enabled. This signal detected the external access
status of other devices connected to the external bus, prohibits other devices from outputting data to the external
bus, and enables reception.
23.6.2 Configuration of external access status output function
Figure 23-13. Configuration of External Access Status Output Function
PM37
P37
EXAE register
(EXAE)
External access
control signal
STOP and IDLE
status signals
EXA signal generator
External access status output circuit (EXA)
External input
P37 port
P37/EXA