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參數(shù)資料
| 型號： | M80C186XL10 |
| 廠商： | Intel Corp. |
| 英文描述： | 16-BIT HIGH-INTEGRATION EMBEDDED PROCESSOR |
| 中文描述： | 16位高集成嵌入式處理器 |
| 文件頁數(shù)： | 6/59頁 |
| 文件大?。?/td> | 590K |
| 代理商： | M80C186XL10 |
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M80C186
Table 1. M80C186 Pin Description
(Continued)
Symbol
PGA
QFP
Type
Name and Function
ARDY
55
23
I
Asynchronous Ready informs the M80C186 that the
addressed memory space or I/O device will complete
a data transfer. The ARDY input pin will accept an
asynchronous input, and is active HIGH. Only the rising
edge is internally synchronized by the M80C186. This
means that the falling edge of ARDY must be
synchronized to the M80C186 clock. If connected to
V
CC
, no WAIT states are inserted. Asynchronous ready
(ARDY) or synchronous ready (SRDY) must be active
to terminate a bus cycle. If unused, this line should be
tied LOW to yield control to the SRDY pin.
SRDY
49
29
I
Synchronous Ready must be synchronized externally
to the M80C186. The use of SRDY provides a relaxed
system-timing specification on the Ready input. This is
accomplished by eliminating the one-half clock cycle
which is required for internally resolving the signal level
when using the ARDY input. This line is active HIGH. If
this line is connected to V
CC
, no WAIT states are
inserted. Asynchronous ready (ARDY) or synchronous
ready (SRDY) must be active before a bus cycle is
terminated. If unused, this line should be tied LOW to
yield control to the ARDY pin.
LOCK
48
30
O
LOCK output indicates that other system bus masters
are not to gain control of the system bus while LOCK is
active LOW. The LOCK signal is requested by the
LOCK prefix instruction and is activated at the
beginning of the first data cycle associated with the
instruction following the LOCK prefix. It remains active
until the completion of the instruction following the
LOCK prefix. No prefetches will occur while LOCK is
asserted. LOCK is active LOW, is driven HIGH for one
clock during RESET, and then floated.
S0, S1, S2
52, 53, 54
26, 25, 24
O
Bus cycle status S0–S2 are encoded to provide bus-
transaction information:
M80C186 Bus Cycle Status Information
S2
S1
S0
Bus Cycle Initiated
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Interrupt Acknowledge
Read I/O
Write I/O
Halt
Instruction Fetch
Read Data from Memory
Write Data to Memory
Passive (no bus cycle)
The status pins float during HOLD/HLDA.
S2 may be used as a logical M/IO indicator, and S1 as
a DT/R indicator.
The status lines are driven HIGH for one clock during
Reset, and then floated until a bus cycle begins.
6
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