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FUJITSU MB91F109 FR30 User Manual

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4.3 Bus Interface

Bus size specification

A bus width can be optionally specified for each area by register setting.

A bus width, set by pins MD2, MD1, and MD0 at reset time, is specified for area 0. After writing
to the mode register (MODR), a bus size is specified by the value set in the AMD0 register.