參數(shù)資料
型號： MC68CK338CPV14
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封裝： PLASTIC, TQFP-144
文件頁數(shù)： 65/133頁
文件大?。?/td> 944K
代理商： MC68CK338CPV14
MC68CK338
MOTOROLA
MC68CK338TS/D
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
Wait States
Per Access
0000
3
0 Wait States
0001
4
1 Wait State
0010
5
2 Wait States
0011
6
3 Wait States
0100
7
4 Wait States
0101
8
5 Wait States
0110
9
6 Wait States
0111
10
7 Wait States
1000
11
8 Wait States
1001
12
9 Wait States
1010
13
10 Wait States
1011
14
11 Wait States
1100
15
12 Wait States
1101
16
13 Wait States
1110
2
Fast Termination
1111
—
External DSACK
Table 27 Address Space Bit Encodings
SPACE[1:0]
Address Space
00
CPU Space
01
User Space
10
Supervisor Space
11
Supervisor/User Space
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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