參數(shù)資料
型號(hào)： MC68HC11K1MFN2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC84
封裝： PLASTIC, LCC-84
文件頁數(shù)： 35/80頁
文件大小： 420K
代理商： MC68HC11K1MFN2
M68HC11 K Series
MC68HC11KTS/D
MOTOROLA
35
Bit 7 — Not implemented
Always reads zero
G2DPC — General-Purpose Chip Select 2 Drives Program Chip Select
0 = CSGP2 does not affect CSPROG
1 = CSGP2 and CSPROG are connected to an OR gate and driven out CSPROG
G2POL — General-Purpose Chip Select 2 Polarity Select
0 = CSGP2 active low
1 = CSGP2 active high
G2AV — General-Purpose Chip Select 2 Address Valid Select
0 = Active during E high time
1 = Active during address valid time
G2SZA–G2SZD — General-Purpose Chip Select 2 Size
4.3.6 Examples of Memory Expansion Using Chip Selects
On the following two pages are examples of memory expansion schemes that use chip select signals
to simplify the interface to the external memory devices. Although schematics are not provided, careful
study of the memory map diagram for each example will reveal the simplicity with which an expanded
system can be created. Both examples require a minimum of external circuitry as well as very little pro-
gram code.
This example is a system consisting of the MCU and a single 27C512-type memory device. This system
uses one chip select and has one window containing eight banks of eight Kbytes each. In this example,
a total of 64 Kbytes is added to the address range of the MCU. Three of the expansion address lines
(XA[15:13]) are used. Register values particular to this example are given below the diagram.
G2SZx
Valid Bits
(MXGS2 = 0)
None
ADDR[15:11]
ADDR[15:12]
ADDR[15:13]
ADDR[15:14]
ADDR15
None
None
None
None
None
None
None
Valid Bits
(MXGS2 = 1)
None
G2A[18:11]
G2A[18:12]
G2A[18:13]
G2A[18:14]
G2A[18:15]
G2A[18:16]
G2A[18:17]
G2A18
None
None
None
None
A
0
0
0
0
0
0
0
0
1
1
1
1
B
0
0
0
0
1
1
1
1
0
0
0
0
C
0
0
1
1
0
0
1
1
0
0
1
1
D
0
1
0
1
0
1
0
1
0
1
0
1
Size (Bytes)
Disabled
2 K
4 K
8 K
16 K
32 K
64 K
128 K
256 K
512 K
Follow Window 1
Follow Window 2
Default to 512 K
1100–1111
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