Fujitsu MB96300 series Hardware Manual page 350

CHAPTER 12 EXTERNAL BUS INTERFACE
Table 12.4-1 Recommended state of external bus pins
Pin name Status
during external bus
access
ALE/AS pause between two
external bus accesses
Hold-state
during external bus
access
UB pause between two
external bus accesses
Hold-state
during external bus
access
LB pause between two
external bus accesses
Hold-state
during external bus
access
HRQ pause between two
external bus accesses
Hold-state
during external bus
access
HAK pause between two
external bus accesses
Hold-state
during external bus
access
CS[5:0] pause between two
external bus accesses
Hold-state
Explanation of the table:
not used
used for data
342
8-bit 16-bit
non-multiplexed non-multiplexed
used for ALE/AS output (if enabled in EBCS:ASE)
outputs inactive level if enabled in EBCS:ASE
not used (outputs '1' if used for UB output (if
enabled in EBCS:UBE) enabled in EBCS:UBE)
used for LB output (if enabled in EBCS:LBE)
outputs '1' if Hold function is enabled with EBCF:HDE
used for CS[5:0] output (if enabled in EACH[5:0]:CSE)
outputs inactive level if enabled in EACH[5:0]:CSE
• The pin is not driven by the External bus module and can be used
as general purpose I/O or for another resource located on this
pin.
• Corresponding input must be enabled by setting PIER to '1'.
Otherwise no data input is possible.
• The external bus interface is driving the write data to the output
pin during the write cycle.
• Another output resource sharing the same pin must be disabled.
• The corresponding DDR must be set to '0' (input), otherwise no
data input is possible.
MB96300 Super Series Hardware Manual
Operation mode
8-bit
multiplexed
Hi-Z
not used (outputs '1' if
enabled in EBCS:UBE)
outputs '1' if enabled in EBCS:UBE
Hi-Z
outputs '1' if enabled in EBCS:LBE
Hi-Z
HRQ input function
(if enabled by EBCF:HDE)
outputs '0'
Hi-Z
16-bit
multiplexed
used for UB output (if
enabled in EBCS:UBE)