參數(shù)資料
型號: MAX3100CPD
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 微控制器/微處理器
英文描述: Dual LVDS Transmitter 8-SOIC -40 to 85
中文描述: 1 CHANNEL(S), 230.4K bps, SERIAL COMM CONTROLLER, PDIP14
封裝: PLASTIC, DIP-14
文件頁數(shù): 10/24頁
文件大小: 263K
代理商: MAX3100CPD
M
S PI/Mic rowire-Compatible
UART in QS OP-16
10
______________________________________________________________________________________
Table 5. Bit Descriptions (continued)
POR
STATE
DESCRIPTION
READ/
WRITE
BIT
NAME
0
SHDNi
w
Software-Shutdown Bit. Enter software shutdown with a write configuration where SHDNi = 1.
Software shutdown takes effect after
CS
goes high, and causes the oscillator to stop as soon
as the transmitter becomes idle. Software shutdown also clears R, T, RA/FE, D0r–D7r,
D0t–D7t, Pr, Pt, and all data in the receive FIFO. RTS and CTS can be read and updated
while in shutdown. Exit software shutdown with a write configuration where SHDNi = 0. The
oscillator restarts typically within 50ms of
CS
going high. RTS and CTS are unaffected. Refer
to the Pin Description for hardware shutdown (
SHDN
input).
Shutdown Read-Back Bit. The read-configuration register outputs SHDNo = 1 when the UART
is in shutdown. Note that this bit is not sent until the current byte in the transmitter is sent (T =
1). This tells the processor when it may shut down the RS-232 driver. This bit is also set imme-
diately when the device is shut down through the
SHDN
pin.
0
SHDNo
r
0
RA/FE
r
Receiver-Activity/Framing-Error Bit. In shutdown mode, this is the RA bit. In normal operation,
this is the FE bit. In shutdown mode, a transition on RX sets RA = 1. In normal mode, a fram-
ing error sets FE = 1. A framing error occurs if a zero is received when the first stop bit is
expected. FE is set when a framing error occurs, and cleared upon receipt of the next proper-
ly framed character independent of the FIFO being enabled. When the device wakes up, it is
likely that a framing error will occur. This error can be cleared with a write configuration. The
FE bit is not cleared on a Read Data operation. When an FE is encountered, the UART resets
itself to the state where it is looking for a start bit.
0
ST
w
Transmit-Stop Bit. One stop bit will be transmitted when ST = 0. Two stop bits will be transmit-
ted when ST = 1. The receiver only requires one stop bit.
0
ST
r
Reads the value of the ST bit.
0
TM
w
Mask for T bit.
IRQ
is asserted if
TM
= 1 and T = 1 (Table 6).
0
TM
r
Reads the value of the
TM
bit (Table 6).
1
T
r
Transmit-Buffer-Empty Flag. T = 1 means that the transmit buffer is empty and ready to
accept another data word.
0
TE
w
Transmit-Enable Bit. If
TE
= 1, then only the
RTS
pin will be updated on
CS
’s rising edge. The
contents of
RTS
, Pt, and D0t–D7t transmit on
CS
’s rising edge when
TE
= 0.
IDLE
SECOND STOP BIT IS OMITTED IF ST = 0.
PE = 1, L = 1
TIME
D0
START
D1
D2
D3
D4
D5
D6
Pt
STOP
STOP
IDLE
IDLE
PE = 1, L = 0
D0
START
D1
D2
D3
D4
D5
D6
D7
Pt
STOP
STOP
IDLE
IDLE
PE = 0, L = 1
D0
START
D1
D2
D3
D4
D5
D6
STOP
STOP
IDLE
IDLE
PE = 0, L = 0
D0
START
D1
D2
D3
D4
D5
D6
D7
STOP
STOP
IDLE
Figure 5. Parity and Word-Length Control
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