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W78C31 Datasheet(PDF) 7 Page - Winbond |
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W78C31 Datasheet(HTML) 7 Page - Winbond |
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7 / 28 page  W78958B Publication Release Date: September 1997 - 7 - Revision A3 AP5.7 −AP5.0 Address Bus, Bits 7−0 TYPE MODE DESCRIPTION Advanced Normal AP5<7:0> output the <7:0> address of the external ROM multiplexed with the <7:0> address of the external data RAM. Emulation When ESEL is held at "L" level, AP5 is the low-byte address input for the SFR/PC and internal RAM. When ESEL is held at "H" level, AP5 is in high impedance state. Standard Normal Pins ROMS1 and ROMS0 determine functions of AP5. For details, see Table D3. Emulation Same as in the advanced type. ROMS1 ROMS0 FUNCTIONS of AP5 0 0 AP5 output the <7:0> address of the external 4K EPROM. 0 1 AP5 output the <7:0> address of the external 8K EPROM. 1 0 AP5 output the <7:0> address of the external 16K EPROM. 1 1 AP5 output the <7:0> address of the external 32K EPROM. Table D3. AP6.7 −AP6.0 Address Bus, Bit 15−8 TYPE MODE DESCRIPTION Advanced Normal AP6<7:0> output the <15:8> address of the external ROM multiplexed with the <15:8> address of the external data RAM. During the execution of "MOVX @Ri," AP6's output comes from the HB register, which is the page register for the high byte address. Emulation When ESEL is held at "L" level, AP6<0> is the address input for the accesses to the SFR/PC and internal RAM. At this time, if AP6<0> = 0, the SFR/PC can be accessed; if AP6<0> = 1, the internal RAM can be accessed. When ESEL is held at "H" level, AP6 is in high impedance state. Standard Normal Pins ROMS1 and ROMS0 determine functions of AP6. For details, see Table D4. Emulation Same as in the advanced type. |
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