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W78C58 Datasheet(PDF) 6 Page - Winbond |
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W78C58 Datasheet(HTML) 6 Page - Winbond |
6 / 28 page W78958B - 6 - P3.7 −P3.0 Port 3, Bits 7−0 TYPE MODE DESCRIPTION Advanced Normal Functions are the same as those in the W78C32. Emulation Frozen in the original state. Standard Normal Functions are the same as those in the W78C52. Emulation Frozen in the original state. DP4.7 −DP4.0 Address/Data Bus, Bits 7−0 TYPE MODE DESCRIPTION Advanced Normal DP4 provides a multiplexed low-byte address/data bus during accesses to external memory. Emulation When ESEL is held at "L" level, DP4 is the data input/output of the SFR/PC and internal RAM. When ESEL is held at "H" level, DP4 is in high impedance state. Standard Normal Pins ROMS1 and ROMS0 determine functions of DP4. For details, see Table D2. Emulation Same as in the advanced type. ROMS1 ROMS0 FUNCTIONS OF DP4 0 0 Provides a multiplexed low-byte address/data bus during accesses to external 4 KB EPROM. 0 1 Provides a multiplexed low-byte address/data bus during accesses to external 8 KB EPROM. 1 0 Provides a multiplexed low-byte address/data bus during accesses to external 16 KB EPROM. 1 1 Provides a multiplexed low-byte address/data bus during accesses to external 32 KB EPROM. Table D2. |
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Similar Description - W78C58 |
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