參數(shù)資料
型號(hào)： M68HC16Y1CFC
廠商： MOTOROLA INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 16-BIT, MROM, MICROCONTROLLER, PQFP16
封裝： QFP-160
文件頁(yè)數(shù)： 102/138頁(yè)
文件大?。?/td> 784K
代理商： M68HC16Y1CFC
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MOTOROLA
MC68HC16Y1
66
MC68HC16Y1TS/D
STRB — Address Strobe/Data Strobe
0 = Address strobe
1 = Data strobe
This bit controls the timing for assertion of a chip select in asynchronous mode. Selecting address
strobe causes chip select to be asserted synchronized with address strobe. Selecting data strobe caus-
es chip select to be asserted synchronized with data strobe.
DSACK — Data Strobe 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. A no-
wait encoding (%0000) corresponds to a three clock-cycle bus. The fast termination encoding (%1110)
corresponds to a two clock-cycle bus — microcontroller modules typically respond at this rate, but fast
termination can also be used to access fast external memory.
SPACE — Address Space
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.
IPL — Interrupt Priority Level
When the space eld is set for CPU space (%00), chip select logic can be used for interrupt acknowl-
edge. During an interrupt acknowledge cycle, the priority level on address lines ADDR[3:1] is compared
to the value in the IPL eld. If the values are the same, then a chip select can be asserted, provided
other option register conditions are met. When the Space eld has any value except %00, the IPL eld
determines whether an access takes place in program or data space. The following table shows IPL eld
encoding.
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
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