參數(shù)資料
型號: 37C672
廠商: SMSC Corporation
英文描述: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
中文描述: 增強的超級I / O控制器,快速紅外線
文件頁數(shù): 30/173頁
文件大?。?/td> 965K
代理商: 37C672
APPLICATION
2.6 Processor mode
2-68
3802 GROUP USER’S MANUAL
_____
(2) Application example of memory expansion in the case where the ONW (One-Wait)
function is used
____
Outline : ONW function is used when the external memory access is slow.
____
If “L” level signal is input to the P32/ ONW
pin while the CPU is in the read or write status,
the read or write cycle corresponding to 1 cycle of
is extended. In the extended period,
___
____
the RD or WR
signal is kept at the “L” level. The ONW function operates only when data is
read from or written into addresses 0000 16 to 000716 and addresses 044016 to FFFF16 .
____
Figure 2.6.7 shows an application example of the ONW
function.
____
Fig. 2.6.7 Application example of the ONW function
3802 group
CNVSS
AD15
8
P5
8
P6
ONW
AD14
AD0
DB0
DB7
RD
WR
M5M27C 256A K-10
M5M5256B P-10
CE
A0–A14
D0–D7
OE
A0–A14
DQ1–DQ8
OE
W
8MH z
VCC = 5.0V
±10 %
External RAM area
(M5M5256B P )
SFR area
Internal RAM area
External RAM area
(M5M5256B P )
External ROM area
(M5M27C256A K )
000016
800016
044016
004016
000816
FFFF16
Memory map
74F04
S
15
8
P4
2
P30, P31
EPRO M
SRAM
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