FUJITSU MB91F109 FR30 - Manual (Page 173)

149
4.16 Relationship between Data Bus Widths and Control Signals
■ Data Bus Width
The following shows the relationship between the internal register and external data bus for
each data bus width:
❍ 16-bit bus width
Figure 4.16-14 Relationship between Internal Register and External Data Bus for 16-bit Bus Width
❍ 8-bit bus width
Figure 4.16-15 Relationship between Internal Register and External Data Bus for 8-bit Bus Width
"00" "10"
AA Read/Write DD BB
BB CC AA
CC
DD
D31
D23
D15
D07
D31
D23
Internal register External bus
Lower part of the output address
"00" "01" "10" "11"
Read/Write
AA DD CC BB AA
BB
CC
DD
D31
D23
D15
D07
D31
Internal register External bus
Lower part of the output address