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HD64F2149YV 数据表(PDF) 172 Page - Renesas Technology Corp |
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HD64F2149YV 数据表(HTML) 172 Page - Renesas Technology Corp |
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172 / 1075 page  Section 6 Bus Controller Rev. 3.00 Jan 18, 2006 page 144 of 1044 REJ09B0280-0300 Bit 5—Bus Width Control (ABW): Specifies whether the external memory space is 8-bit access space or 16-bit access space. Bit 5 ABW Description 0 External memory space is designated as 16-bit access space 1 External memory space is designated as 8-bit access space (Initial value) Bit 4—Access State Control (AST): Specifies whether the external memory space is 2-state access space or 3-state access space, and simultaneously enables or disables wait state insertion. Bit 4 AST Description 0 External memory space is designated as 2-state access space Wait state insertion in external memory space accesses is disabled 1 External memory space is designated as 3-state access space (Initial value) Wait state insertion in external memory space accesses is enabled Bits 3 and 2—Wait Mode Select 1 and 0 (WMS1, WMS0): These bits select the wait mode when external memory space is accessed while the AST bit is set to 1. Bit 3 Bit 2 WMS1 WMS0 Description 0 0 Program wait mode (Initial value) 1 Wait-disabled mode 1 0 Pin wait mode 1 Pin auto-wait mode |
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