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参数资料
| 型号： | MA28155 |
| 厂商： | Dynex Semiconductor Ltd. |
| 英文描述： | Radiation Hard Programmable Peripheral Interface |
| 中文描述： | 辐射硬可编程外设接口 |
| 文件页数： | 11/20页 |
| 文件大小： | 214K |
| 代理商： | MA28155 |
MA28155
11/20
BIDIRECTIONAL BUS L/O CONTROL
Signal Definition (Mode 2)
INTR (Interrupt Request):
A high on this output can be used to interrupt the CPU for
both input or output operations.
Output Operations
OBFN
(Output Buffer Full):
The OBF output will go low to indicate that the CPU has
written data out to port A.
ACKN
(Acknowledge):
A low on this input enables the tri-state output buffer of port
A to send out the data. Otherwise, the output buffer will be in
the high impedance state,
INTE 1 (INTE register bit associated with OBFN):
Controlled by Bit Set/Reset of PC
6
.
Input Operations
STBN
(Strobe input):
A low on this input loads data in to the input latch,
IBF (Input Buffer Full Register Bit):
A high on this output indicates data has been loaded in to
the input latch,
INTE 2 (The INTE register bit associated with IBF).
Controlled by Bit Set/Reset of PC
4
.
Figure 16: Mode 2 Bidirectional
DSN
RD/WN
OBF
A
N
ACK
A
N
STB
A
N
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