Figure 3.2.1B External Memory Access Timing Chart - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

External 16-bit bus mode
P37/CLK
P33/WRHX
P32/WRLX
P31/RDX
P30/ALE
P27 to 20/A23 to16
P17 to 10/AD15 to 08
P07 to 00/AD07 to 00
P37/CLK
P33/WRHX
P32/WRLX
P31/RDX
P30/ALE
P27 to 20/A23 to 16
P17 to 10/AD15 to 08
P07 to 00/AD07 to 00
P37/CLK
P33/WRHX
P32/WRLX
P31/RDX
P30/ALE
P27 to 20/A23 to 16
P17 to 10/AD15 to 08
P07 to 00/AD07 to 00
* Design the external circuit so that data is always read in word mode.
Low-speed memory or peripheral circuit can be accessed depending on the setting of the P36/RDY pin or
the automatic ready function selection register (ARSR).
MB90580 Series
8-bit bus width byte
read
Even-number address
byte read
Read address
Read
address
Read
address
Odd-number address
byte read
Read address
Read
address
Read
address
Even-number address
word read
Read address
Read
address
Read
address

Figure 3.2.1b External memory access timing chart

8-bit bus width byte
write
Even-number address
byte write
Write address
Write
Invalid
address
Write
Undefined
address
Read data
Odd-number address
byte write
Write address
Write
address
Write
Invalid
address
Read data
Even-number address
word write
Write address
Write
address
Write
address
Read data
3.2 External Memory Access
Read
address
Read
address
Read
address
Write data
Read
address
Read
address
Read
Undefined
address
Write data
Read
address
Read
address
Read
address
Write data
Chapter 3: Memory 43