FUJITSU MB91F109 FR30 - Manual (Page 39)

15
1.5 Pin Functions
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40 A16/P60
A17/P61
A18/P62
A19/P63
A20/P64
A21/P65
A22/P66
A23/P67 F Bits 16 to 23 of external address bus.
When these pins are not used for the address bus,
they can be used as general-purpose I/O ports (P60
to P67).
Table 1.5-1 Pin Functions (1/5)
NO. Pin name I/O circuit
format
Function
Table 1.5-2 Pin Functions (2/5)
NO. Pin name I/O circuit
format
Function
41 A24/P70/EOP0 F Bit 24 of external address bus.
This pin is enabled when DMAC EOP output is
enabled.
[EOP0] DMAC EOP output (ch0)
[P70] When this pin is not used as A24 and EOP0,
the pin can be used as a general-purpose I/O port.
42 RDY/P80 E External Ready input. 0 is input when the bus cycle
being executed is not completed. When the pin is
not used for this purpose, it can be used as a
general-purpose I/O port.
43 BGRNTX/P81 F Output of external bus release acceptance. L is
output when the external bus has been released.
When the pin is not used for this purpose, it can be
used as a general-purpose I/O port.
44 BRQ/P82 E Input of external bus release request. 1 is input to
request that the external bus be released. When
the pin is not used for this purpose, it can be used
as a general-purpose I/O port.
45 RDX/P83 F External bus read strobe.
When the pin is not used for this purpose, it can be
used as a general-purpose I/O port.
46 WR0X/P84 F External bus write strobe. Individual control signals
and data bus byte positions have the following
relationships: