參數(shù)資料
型號： MC68332GCFC25B1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 25 MHz, MICROCONTROLLER, PQFP132
封裝： 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, QFP-132
文件頁數(shù)： 39/109頁
文件大?。?/td> 787K
代理商： MC68332GCFC25B1
MC68332
MOTOROLA
MC68332TS/D
35
DSACK — Data and Size Acknowledge
This field specifies the source of DSACK in asynchronous mode. It also allows the user to adjust bus
timing with internal DSACK generation by controlling the number of wait states that are inserted to op-
timize bus speed in a particular application. The following table shows the DSACK field encoding. The
fast termination encoding (1110) is used for two-cycle access to external memory.
SPACE — Address Space
Use this option field to select an address space for the chip-select logic. The CPU32 normally operates
in supervisor or user space, but interrupt acknowledge cycles must take place in CPU space.
IPL — Interrupt Priority Level
If the space field is set for CPU space (00), 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 the IPL field. If the values are the same, a chip select is asserted, provided that other option
register conditions are met. The following table shows IPL field encoding.
This field only affects the response of chip selects and does not affect interrupt recognition by the CPU.
Any level means that chip select is asserted regardless of the level of the interrupt acknowledge cycle.
DSACK
Description
0000
No Wait States
0001
1 Wait State
0010
2 Wait States
0011
3 Wait States
0100
4 Wait States
0101
5 Wait States
0110
6 Wait States
0111
7 Wait States
1000
8 Wait States
1001
9 Wait States
1010
10 Wait States
1011
11 Wait States
1100
12 Wait States
1101
13 Wait States
1110
Fast Termination
1111
External DSACK
Space Field
Address Space
00
CPU Space
01
User Space
10
Supervisor Space
11
Supervisor/User Space
IPL
Description
000
Any Level
001
IPL1
010
IPL2
011
IPL3
100
IPL4
101
IPL5
110
IPL6
111
IPL7
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關PDF資料
PDF描述
MC68332ACAG25 32-BIT, 25 MHz, MICROCONTROLLER, PQFP144
SPAKMC332ACFC16 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
SPAKMC332GCFV16 32-BIT, 16 MHz, MICROCONTROLLER, PQFP144
SPAKMC332ACFV16 32-BIT, 16 MHz, MICROCONTROLLER, PQFP144
MC68334GMFC16 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
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