Renesas 7700 FAMILY User Manual page 275

CONNECTION WITH EXTERNAL DEVICES
12.1 Signals required for accessing external devices
External data bus width = 8 bits (BYTE = "H")
<8/16-bit data access>
Note: When accessing 16-bit data, 2 times of access are performed in
Fig. 12.1.6 Example of operating waveforms of signals input and output to/from externals (2)
12–10
(e) Access from even address
E
ALE
A to A
0 7
A to A
8 15
Address
A /D to A /D
16 0 23 7
A
0
BHE
(f) Access from odd address
E
ALE
A to A
0 7
A to A
8 15
A /D to A /D Address
16 0 23 7
A
0
BHE
the sequence of the low-order 8 bits and high-order 8 bits.
7751 Group User's Manual
Address Address
Address Address
Data Address
8-bit data access
16-bit data access
Address Address
Address Address
Address
Data
8-bit data access
16-bit data access
Data
Data