MB91121 데이터 시트보기 (PDF) - Fujitsu
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MB91121 Datasheet PDF : 97 Pages
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MB91121
s SETTING MODE
1. Pin
• Mode setting pins and modes
Mode setting pins
MD3 MD2 MD1 MD0
Mode name
Reset vector
access area
1 0 0 0 External vector mode 0 External
1 0 0 1 External vector mode 1 External
1010
1 0 1 1 Internal vector mode
Internal
1 1
0
* : MB91121 does not support single-chip mode.
External data
bus width
Bus mode
8 bits
16 bits
External ROM/external
bus mode
Inhibited
(Mode register) Single-chip mode*
Inhibited
Inhibited
2. Registers
• Mode setting registers (MODR) and modes
Address
Initial value
Access
0000 07FFH
M1 M0
*
*
*
*
*
*
XXXX XXXXB
W
W : Write only
X : Indeterminate
* : Always write “0” except for M1 and M0.
Bus mode setting bit
• Bus mode setting bits and functions
M1
M0
Functions
0
0
Single-chip mode
0
1
Internal ROM/external bus mode
1
0
External ROM/external bus mode
1
1
Note : Because of without internal ROM, MB91121 allows “10B” setting value only.
Note
Inhibited
21
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