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參數(shù)資料
| 型號(hào)： | UPD78218ACW |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁(yè)數(shù)： | 33/66頁(yè) |
| 文件大?。?/td> | 510K |
| 代理商： | UPD78218ACW |
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33
μ
PD78217A, 78218A
4.2.1
Memory Expansion
The following modes have been prepared as a memory expansion function.
External memory expansion mode
: Expands the program memory and data memory to 31488 bytes (64256
bytes for the
μ
PD78217A) externally. However, this area can be used
unconditionally under the ROM-less mode (EA = L).
: Expands the data memory by 960 Kbytes and become a 1-Mbyte
memory space.
1-Mbyte expansion mode
4.2.2
Programmable Wait
A wait can be independently inserted to the memory mapped on both a normal address (00000H to 0FFFFH) and
an expanded address (10000H to FFFFFH). Therefore, the efficiency of the entire system is not decreased.
4.2.3
Pseudo-Static RAM Refresh Function
The refresh operations are as follows.
Pulse refresh
Power-down self refresh :
:
Outputs the refresh pulse to REFRQ pin in synchronization with a bus cycle.
Outputs a low-level to the REFRQ pin in the standby mode and holds the contents
of the pseudo-static RAM.
4.2
LOCAL BUS INTERFACE
The
μ
PD78217A/78218A can be connected to an external memory and I/O (memory mapped I/O), and supports
the 1M-byte memory space (see
Fig.3-1
).
Fig. 4-4 Local Bus Interface Example
μ
PD78218A
Latch
A16-A19
RD
WR
REFRQ
AD0-AD7
ASTB
A8-A15
D
Pseudo SRAM
PROM
PD27C256A
μ
PD24C1000
Data Bus
Address Bus
Gate Array
I/O Expansion
Centronics I/F, etc.
Kanji-Character
Generator
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