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MB91155 Datasheet(PDF) 25 Page - fujitsu semiconductor |
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MB91155 Datasheet(HTML) 25 Page - fujitsu semiconductor |
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25 / 105 page  MB91F155A/MB91155/MB91154 25 [Precautions When Writing to the MODR] Before writing to the MODR, be sure to set AMD0 through 5 and determine the bus width in each CS (Chip Select) area. The MODR does not have bus width setting bits. The bus width value set with mode pins MD2 through 0 is enabled before writing to the MODR and the bus width value set with BW1 and 0 of AMD0 through 5 is enabled after writing to the MODR. For example, the external reset vector is normally executed with area 0 (the area where CS0 is active) and the bus width at that time is determined by pins MD 2 through 0. Suppose that the bus width is set to 32 or 16 bits in MD2 though 0 but no value is specified in AMD 0. If the MODR is written in this state, area 0 then switches to 8-bit bus mode and operates the bus since the initial bus width in AMD0 is set to 8 bits. This causes a malfunction. In order to prevent this type of problem, AMD0 through 5 must always be set before writing to the MODR. Writing to the MODR. AMD0 to AMD5 BW1, 0 Designated bus width : MD2,1,0 RST (Reset) |
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