參數(shù)資料
型號: MC68CK338
廠商: Motorola, Inc.
元件分類: 32位微控制器
英文描述: Highly Integrated, Low-Power, 32-Bit Microcontroller
中文描述: 高度集成,低功耗,32位微控制器
文件頁數(shù): 37/133頁
文件大?。?/td> 798K
代理商: MC68CK338
MC68CK338
MC68CK338TS/D
MOTOROLA
37
SPACE[1:0] — Address Space
Use this option field to select an address space for the chip-select logic. The CPU32L normally operates
in supervisor or user space, but interrupt acknowledge cycles must take place in CPU space.
Table 27
shows address space bit encodings.
IPL[2:0] — Interrupt Priority Level
If the space field is set for CPU space, chip-select logic can be used for interrupt acknowledge. During
an interrupt acknowledge cycle, the priority level on address lines ADDR[3:1] is compared to the value
in IPL[2:0]. If the values are the same, a chip-select is asserted, provided that other option register con-
ditions are met.
Table 28
shows IPL[2:0] encoding.
Table 26 DSACK Field Encoding
DSACK[3:0]
Clock Cycles Required
Per Access
3
4
5
6
7
8
9
10
11
12
13
14
15
16
2
Wait States
Per Access
0 Wait States
1 Wait State
2 Wait States
3 Wait States
4 Wait States
5 Wait States
6 Wait States
7 Wait States
8 Wait States
9 Wait States
10 Wait States
11 Wait States
12 Wait States
13 Wait States
Fast Termination
External DSACK
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Table 27 Address Space Bit Encodings
SPACE[1:0]
00
01
10
11
Address Space
CPU Space
User Space
Supervisor Space
Supervisor/User Space
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