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CHAPTER 4 External Bus Interface
4.6.1 Relationship between Data Bus Width and Control Signal
The control signal of WR0 to WR1 always supports the byte position of the data bus 1:1
regardless of big endian/little endian is used, or the data bus width.
■ The Relationship between the Data Bus Width and Control Signal
In this section, the byte position of the data bus for this product used by the data bus width that has been
set, and control signals that support it are summarized.
●
The time division input/output bus interface
Figure 4.6-1 Data bus width and control signals under the time division input/output bus interface
Data bus Control siganal Control siganalData bus
WR0
WR1
a) 16 bit bus width b) 8 bit bus width
(D15 to 0: unused) (D23 to 0: unused)
Output address
A15 to 8
A7 to 0
Output address
A7 to 0
D31
D16
WR0