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參數(shù)資料
| 型號： | M38073M4-218FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Low-Power Configurable Multiple-Function Gate 6-SOT-23 -40 to 85 |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 54/74頁 |
| 文件大小： | 1182K |
| 代理商： | M38073M4-218FP |
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54
MITSUBISHI MICROCOMPUTERS
3807 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Bus control at memory expansion
The 3807 group has a built-in ONW function to facilitate access to
external (expanded) memory and I/O devices in memory expansion
mode or microprocessor mode.
If an "L" level signal is input to port P3
2
/ONW when the CPU is in a
read or write state, the corresponding read or write cycle is extended
by one cycle of
φ
. During this extended period, the RD or WR signal
remains at "L". This extension function is valid only for writing to and
reading from addresses 0000
16
to 0007
16
and 0840
16
to FFFF
16
, and
only read and write cycles are extended.
_____
Fig. 61. ONW function timing
φ
RD
WR
ONW
*
*
Read cycle
Write cycle
Dummy cycle Write cycle
Read cycle Dummy cycle
AD
15
—AD
0
* Period during which ONW input signal is received
During this period, the ONW signal must be fixed at either "H" or "L". At all other times, the input level of the ONW
signal has no affect on operations. The bus cycles is not extended for an address in the area 0008
16
to 083F
16,
regardless of whether the ONW signal is received.
*
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