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參數(shù)資料
| 型號： | 82C51A |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER |
| 中文描述： | 通用同步異步收發(fā)器 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 203K |
| 代理商： | 82C51A |
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10/26
Semiconductor
MSM82C51A-2RS/GS/JS
TXRDY (output terminal)
This is an output terminal which indicates that the MSM82C51A-2 is ready to accept a
transmitted data character. But the terminal is always at low level if
CTS
= high or the device
was set in “TX disable status” by a command.
Note:
TXRDY status word indicates that transmit data character is receivable,
regardless
of
CTS
or command.
If the CPU writes a data character, TXRDY will be reset by the leading edge or
WR
signal.
TXEMPTY (Output terminal)
This is an output terminal which indicates that the MSM82C51A-2 has transmitted all the
characters and had no data character.
In “synchronous mode,” the terminal is at high level, if transmit data characters are no longer
remaining and sync characters are automatically transmitted. If the CPU writes a data
character, TXEMPTY will be reset by the leading edge of
WR
signal.
Note : As the transmitter is disabled by setting
CTS
“High” or command, data written
before disable will be sent out. Then TXD and TXEMPTY will be “High”.
Even if a data is written after disable, that data is not sent out and TXE will be
“High”.After
the transmitter is enabled, it sent out. (Refer to Timing Chart of
Transmitter Control and Flag
Timing)
TXC
(Input terminal)
This is a clock input signal which determines the transfer speed of transmitted data.
In “synchronous mode,” the baud rate will be the same as the frequency of
TXC
.
In “asynchronous mode”, it is possible to select the baud rate factor by mode instruction.
It can be 1, 1/16 or 1/64 the
TXC
.
The falling edge of
TXC
sifts the serial data out of the MSM82C51A-2.
RXD (input terminal)
This is a terminal which receives serial data.
RXRDY (Output terminal)
This is a terminal which indicates that the MSM82C51A-2 contains a character that is ready to
READ.
If the CPU reads a data character, RXRDY will be reset by the leading edge of
RD
signal.
Unless the CPU reads a data character before the next one is received completely, the preceding
data will be lost. In such a case, an overrun error flag status word will be set.
RXC
(Input terminal)
This is a clock input signal which determines the transfer speed of received data.
In “synchronous mode,” the baud rate is the same as the frequency of
RXC
.
In “asynchronous mode,” it is possible to select the baud rate factor by mode instruction.
It can be 1, 1/16, 1/64 the
RXC
.
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