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■ Mode Data
Data that the CPU writes at "0000 07FF
H
" after reset is called mode data.
The mode register (MODR) exists in "0000 07FF
H
" and after setting to this register, operation is carried out
under the set up mode of this register. The mode register can be written only once after resetting.
The set value of this register is valid immediately after writing.
■ Mode Register (MODR)
Figure 3.11-1 Mode register (MODR)
[bit7, 6]: M1, M0
There are bus mode setting bits. These bits specify the bus mode after writing the mode register.
Note:
Only set the "00" and "01" for this product above.
[bit5-0]:-
System Reserved bit
Always write "0" to these bits.
Initial value
Address: 0000 07FF
H M1 M0 XXXXXXXXB
Bus mode setting mode
WW
Access
76543210
bit
Table 3.11-2 Bus mode setting bits and function
M1 M0 Function Remark
0 0 Single-chip mode
0 1 Internal ROM external bus mode
1 0 External ROM external bus mode Setting disabled
1 1 - Setting disabled