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參數(shù)資料
| 型號： | MA28151 |
| 廠商： | Dynex Semiconductor Ltd. |
| 英文描述： | Radiation hard Programmable Communication Interface |
| 中文描述： | 輻射硬可編程通信接口 |
| 文件頁數(shù)： | 10/22頁 |
| 文件大小： | 186K |
| 代理商： | MA28151 |
MA28151
10/22
3.12 STATUS READ DEFINITION
In data communication systems it is often necessary to
examine the status of the active device to ascertain if errors
have occurred or other conditions that require the processor’s
attention. The MA28151 has facilities that allow the
programmer to read the status of the device at any time during
the functional operation. (Status update is inhibited during
status read).
A normal read command is issued by the CPU with CDN
high to accomplish this function.
Some of the bits in the Status Read Format have identical
meanings to external output pins so that the MA28151 can be
used in a completely polled or interrupt-driven environment.
TxRDY is an exception.
Note that status update can have a maximum delay of 28
clock periods from the actual event affecting the status.
3.13 STATUS READ FORMAT
D
7
DSR
D
6
SYNDET
D
5
FE
D
4
OE
D
3
PE
D
2
ETx
D
1
RxRDY
D
0
TxRDY
PARITY ERROR
The PE flag is set when the
parity error is detected. It is
reset by the ER bit of the
Command Instruction. PE does
not inhibit the operation of the
MA28151.
Note 1: TxRDY status bit has different meanings from the TxRDY output pin. The former
is not conditioned by CTS and TxEN, the latter is conditioned by both CTS and TxEN.
ie. TxRDY status bit 0 DB buffer empty
TxRDY pin out = DB buffer empty OR (CTSN = 0) OR (TxEN = 1)
Note 1
Same as I/O pins
OVERRUN ERROR
The OE flag is set when the
CPU does not read a character
before the next one becomes
available. It is reset by the ER
bit of the Command Instruction
OE does not inhibit operation
of the MA28151, however the
previously overrun character is
lost.
FRAMING ERROR (ASYNC
ONLY)
The FE flag is set when a valid
Stop bit is not detected at the
end of every character. It is
reset by the ER bit of the
Command Instruction. FE does
not inhibit the operation of the
MA28151.
DATA SET READY
Indicates that the DSR is at a
zero level.
Figure 13: Status Read Format
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| MA28151GBB | 功能描述:專用陶瓷電容器 HF CHIP RoHS:否 制造商:Panasonic Electronic Components 電容:470 pF 容差:10 % 電壓額定值:250 VAC 工作溫度范圍:- 25 C to + 125 C 端接類型:SMD/SMT 外殼代碼 - in: 外殼代碼 - mm: |
| MA28151GBN | 功能描述:專用陶瓷電容器 HF CHIP RoHS:否 制造商:Panasonic Electronic Components 電容:470 pF 容差:10 % 電壓額定值:250 VAC 工作溫度范圍:- 25 C to + 125 C 端接類型:SMD/SMT 外殼代碼 - in: 外殼代碼 - mm: |
| MA28151JBB | 功能描述:專用陶瓷電容器 HF CHIP RoHS:否 制造商:Panasonic Electronic Components 電容:470 pF 容差:10 % 電壓額定值:250 VAC 工作溫度范圍:- 25 C to + 125 C 端接類型:SMD/SMT 外殼代碼 - in: 外殼代碼 - mm: |
| MA28151JBN | 功能描述:專用陶瓷電容器 HF CHIP RoHS:否 制造商:Panasonic Electronic Components 電容:470 pF 容差:10 % 電壓額定值:250 VAC 工作溫度范圍:- 25 C to + 125 C 端接類型:SMD/SMT 外殼代碼 - in: 外殼代碼 - mm: |
| MA28151KBB | 功能描述:專用陶瓷電容器 HF CHIP RoHS:否 制造商:Panasonic Electronic Components 電容:470 pF 容差:10 % 電壓額定值:250 VAC 工作溫度范圍:- 25 C to + 125 C 端接類型:SMD/SMT 外殼代碼 - in: 外殼代碼 - mm: |
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