Renesas 7700 FAMILY User Manual page 274

CONNECTION WITH EXTERNAL DEVICES
External data bus width = 16 bits (BYTE = "L")
<16-bit data access>
(a) Access from even address
(b) Access from odd address
<8-bit data access>
(c) Access to even address
ALE
A to A
0
A /D to A /D
8 8 15
A /D to A /D
16 0 23
A
BHE
Fig. 12.1.5 Example of operating waveforms of signals input and output to/from externals (1)
12.1 Signals required for accessing external devices
E
ALE
A to A
0 7
A /D to A /D
Address
8 8 15 15
Address
A /D to A /D
16 0 23 7
A
0
BHE
E
ALE
A to A
0 7
Address
A /D to A /D
8 8 15 15
Address
A /D to A /D
16 0 23 7
A
0
BHE
E
Address
7
Address
15
Address
Data(even)
7
0
7751 Group User's Manual
Address
Data(odd)
Data(even)
Address Address
Data(odd) Address
Address Data(even)
(d) Access to odd address
ALE
A to A
0
A /D to A /D
8 8 15
A /D to A
16 0 23
BHE
E
Address
7
Address
Data(odd)
15
Address
/D
7
A
0
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