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CHAPTER 9 MEMORY ACCESS MODES
9.1.2 Mode Data
Mode data is stored at FFFFDF
H
of main memory and used for controlling the CPU
operation. This data is fetched during a reset sequence and stored in the mode register
inside the device. The mode register value can be changed only by a reset sequence.
The setting of this register is valid after the reset sequence.
Always set the reserved bits to "0".
■ Mode Data
Figure 9.1-1 Mode Data Configuration
[bit7 and bit6] M1, M0 (bus mode setting bits)
The M1 and M0 bits are used to specify the operation mode after the reset sequence is completed. Table
9.1-3 shows the relationship between the M1 and M0 bits and the functions.
76543210
Address: FFFFDF
H
M1 M0
Reserved Reserved Reserved Reserved Reserved Reserved
Table 9.1-3 Function of M1, M0 (bus mode setting bit)
M1 M0 Function Remarks
0 0 Single-chip mode
0 1 Setting disabled
1 0
1 1