參數(shù)資料
型號(hào)： X88C75 SLIC
英文描述： Port Expander and EE Memory(雙面，可同時(shí)讀寫(xiě)，與通用8051系列直接接口,微控制器外圍芯片)
中文描述： 端口擴(kuò)展和EE內(nèi)存（雙面，可同時(shí)讀寫(xiě)，與通用8051系列直接接口，微控制器外圍芯片）
文件頁(yè)數(shù)： 14/28頁(yè)
文件大小： 240K
代理商： X88C75 SLIC
X88C75 SLIC
E
2
14
Example 2
Applications requiring more than 8K bytes of program
memory space can be implemented using the basic
system architecture depicted in example 1 along with an
additional memory device such as the X28C256. Since
this device requires non-multiplexed address/data buses,
the X88C75 LAM feature is used to output the low order
address byte. The SFRM can be mapped to any 64x1K
page, but the X28C256 should be mapped to the upper
program memory address space and out of the
E
2
M
address range (0000-1FFFH.) This technique may also
be used for other external byte wide memories such as
SRAMs or EPROMs.
APPLICATION EXAMPLES
This section gives examples of most widely used em-
bedded systems architectures using the X88C75 and
80C51 microcontroller. However, keep in mind that
other microcontrollers are also supported by the X88C75
and/or other SLIC devices that Xicor manufactures.
Example 1
In this system, the X88C75 is the only parallel device
residing on the multiplexed address and data bus. There
may be other peripherals on the system board which are
controlled by the ports on the X88C75. This configura-
tion maps the EEM to a program/data memory address
in the range of 0000-1FFFH. The SFRM can be mapped
to any of the 64 x 1K pages within the data memory
space.
Figure 14. Example 1
ALE
WR
RD
PSEN
ALE
WR
RD
PSEN
CE
CE
OE
WE
I/O7-I/O0
A14-A8
EA
A15
2887 ILL F19
PB
A7-A0
STRA
PA
A7:0
8
X88C75
8051
X28C256
A15:8
AD7:0
D7:0
A15:8
STRB
RESET
Figure 15. Example 2
ALE
WR
RD
PSEN
ALE
WR
RD
PSEN
CE
EA
STRA
PA
X88C75
8051
A15:8
AD7:0
STRB
2887 ILL F18
PB
RESET
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