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W78C458 Datasheet(PDF) 6 Page - Winbond

Part # W78C458
Description  8-BIT EMULATION MICROCONTROLLER
Download  28 Pages
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W78C458 Datasheet(HTML) 6 Page - Winbond

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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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