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MB91121 Datasheet(PDF) 21 Page - fujitsu semiconductor |
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MB91121 Datasheet(HTML) 21 Page - fujitsu semiconductor |
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21 / 97 page  MB91121 21 s SETTING MODE 1. Pin • Mode setting pins and modes * : MB91121 does not support single-chip mode. 2. Registers • Mode setting registers (MODR) and modes • Bus mode setting bits and functions Note : Because of without internal ROM, MB91121 allows “10B” setting value only. Mode setting pins Mode name Reset vector access area External data bus width Bus mode MD3 MD2 MD1 MD0 1000 External vector mode 0 External 8 bits External ROM/external bus mode 1001 External vector mode 1 External 16 bits 1010 Inhibited 1011 Internal vector mode Internal (Mode register) Single-chip mode* 11 Inhibited 0 Inhibited M1 M0 Functions Note 0 0 Single-chip mode 0 1 Internal ROM/external bus mode 1 0 External ROM/external bus mode 11 Inhibited W : Write only X : Indeterminate * : Always write “0” except for M1 and M0. M1 M0 ****** Initial value Access XXXX XXXXB W Address 0000 07FFH Bus mode setting bit |
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