參數(shù)資料
型號(hào): M38001S8-XXXFP
廠商: Mitsubishi Electric Corporation
元件分類: DC/DC變換器
英文描述: 1 watt dc-dc converters
中文描述: 1瓦的DC - DC轉(zhuǎn)換器
文件頁數(shù): 44/173頁
文件大?。?/td> 4203K
代理商: M38001S8-XXXFP
1-30
HARDWARE
3800 GROUP USER’S MANUAL
Bus control with memory expansion
The 3800 group has a built-in ONW function to facilitate access to
external memory and I/O devices in memory expansion mode or
microprocessor mode.
If an “L” level signal is input to the ONW pin when the CPU is in a
read or write state, the corresponding read or write cycle is ex-
tended by one cycle of
φ
. During this extended period, the RD or
WR signal remains at “L”. This extension period is valid only for
writing to and reading from addresses 0000
16
to 0007
16
and
0440
16
to FFFF
16
in microprocessor mode, 0040
16
to YYYY
16
in
memory expansion mode, and only read and write cycles are ex-
tended.
Fig. 30 ONW function timing
FUNCTIONAL DESCRIPTION
φ
Read cycle
Write cycle
Dummy cycle Write cycle
Read cycle Dummy cycle
AD
15
to 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 043F
16,
regardless of whether the ONW signal
is received.
8
:
8
8
8
ONW
WR
RD
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