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UPD784021 Datasheet(PDF) 49 Page - NEC

Part # UPD784021
Description  16/8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  90 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD784021 Datasheet(HTML) 49 Page - NEC

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mPD784020, 784021
10. LOCAL BUS INTERFACE
The local bus interface enables the connection of external memory and I/O devices (memory-mapped I/O). It
supports a 1M-byte memory space. (See Fig. 10-1.)
Fig. 10-1 Example of Local Bus Interface
10.1
MEMORY EXPANSION
By adding external memory, program memory or data memory can be expanded, 64K bytes at a time, to
approximately 1M byte (three steps).
Data bus
Latch
Gate array for I/O
expansion including
Centronics interface
circuit, etc.
RD
WR
REFRQ
AD0-AD7
ASTB
Pseudo SRAM
PROM
PD27C1001A
PD784021
A16-A19
µ
µ
Address bus
Data bus
A8-A15
Kanji character
generator
PD24C1000
µ



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