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參數(shù)資料
型號: MC68HC916X1
廠商: Motorola, Inc.
英文描述: 16-Bit Modular Microcontroller(16位模塊化微控制器)
中文描述: 16位微控制器模塊(16位模塊化微控制器)
文件頁數(shù): 43/172頁
文件大小: 1035K
代理商: MC68HC916X1
MC68HC916X1
MC68HC916X1TS/D
MOTOROLA
43
SPACE[1:0] — Address Space Select
This option field is used to select an address space to be used by the chip select logic. The CPU16 nor-
mally operates in supervisor space. All space types can be used. Interrupt acknowledge cycles take
place in CPU space.
Table 29
shows address space bit encodings.
IPL[2:0] — Interrupt Priority Level
When the SPACE[1:0] field is set for CPU space (%00), chip-select logic can be used for interrupt ac-
knowledge. During an interrupt acknowledge cycle, the priority level on address lines ADDR[3:1] is com-
pared to the value in the IPL[2:0] field. If the values are the same, then a chip-select can be asserted,
provided other option register conditions are met. When the SPACE[1:0] field has any value except
%00, the IPL[2:0] field determines whether an access takes place in program or data space.
Table 30
shows IPL[2:0] field encoding.
1. The CPU16 executes code only in supervisor
mode, therefore this space field encoding has
no effect. Supervisor/User space is equivalent
to supervisor space encoding.
Table 28 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 Inserted
Per Access
0
1
2
3
4
5
6
7
8
9
10
11
12
13
1 (Fast Termination)
External DSACK
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Table 29 Address Space Bit Encodings
SPACE[1:0]
00
01
10
11
Address Space
CPU Space
User Space
1
Supervisor Space
Supervisor/User Space
1
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