參數(shù)資料
型號(hào)： X68C75L
英文描述： Port Expander and E2 Memory
中文描述： 端口擴(kuò)展和E2內(nèi)存
文件頁(yè)數(shù)： 15/26頁(yè)
文件大?。?/td> 123K
代理商： X68C75L
15
X68C75 SLIC
E
2
Example 3
If an application requires larger program memory stor-
age and both extra ports, then example 2 does not meet
this requirement. Since the LAM feature uses port B to
output the non-multiplexed address, then port B cannot
be also used as general purpose I/O. The solution to this
problem is to use X88C64, which interfaces to a multi-
plexed bus and takes an active LOW
CE
input. Example
3 maps the X88C64 to the bottom 8K program memory
space in the range of 0000-1FFFH. This approach
provides a total of 16K-bytes of program memory. Using
the same approach, two additional X88C64 devices can
be added and A13-A14 can be used as their
CE
inputs,
for a total of 32K-bytes of program memory. Ports A and
B are still available to handle any general purpose I/O
functions.
Example 4
For those applications using extensive I/O, up to 128
I/O pins are obtained by placing 8 of the X68C75 devices
on the same bus. This approach gives a total of 64K-bytes
of program memory space, and 128 I/O pins. Note that
the SFRM can overlap the E
2
M address space, however,
only the SFR resources are accessible and the associ-
ated E
2
memory location are not available.
Figure 17. Example 4
Figure 16. Example 3
X8C5
68HC11
A[15:8]
2899 ILL F19
AD[7:0]
PA
STRB
PB
STRA
128 I/O
VCC
AS
R/W
E
AS
R/W
E
CE
AS
R/W
E
AS
R/W
E
CE
RD
ALE
R/W
A/D7-A/D0
A12-A8
CE
PSEN
A15
VCC
VCC
2899 ILL F18
STRA
PA
X68C75
68HC11
X88C64
A[15:8]
AD[7:0]
AD7:0
A15:8
STRB
RESET
PB
相關(guān)PDF資料
PDF描述
X68C75LI Port Expander and E2 Memory
X68C75LM Port Expander and E2 Memory
X68C75P Port Expander and E2 Memory
X68C75PI Port Expander and E2 Memory
X68C75PM Port Expander and E2 Memory
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
X68C75LI 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:Port Expander and E2 Memory
X68C75LM 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:Port Expander and E2 Memory
X68C75P 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:Port Expander and E2 Memory
X68C75PI 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:Port Expander and E2 Memory
X68C75PM 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:Port Expander and E2 Memory
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