參數(shù)資料
型號(hào)： XR16L651
廠商： Exar Corporation
英文描述： 2.5V, 3.3V and 5V Low Power UART with 32-Byte FIFO(2.5V, 3.3V和5V 低功耗通用異步接收器/發(fā)送器（帶32字節(jié)先進(jìn)先出）)
中文描述： 2.5V，3.3V與5V的低功耗的UART與32字節(jié)的FIFO（2.5伏，3.3伏和5V的低功耗通用異步接收器/發(fā)送器（帶32字節(jié)先進(jìn)先出））
文件頁(yè)數(shù)： 20/46頁(yè)
文件大小： 516K
代理商： XR16L651
XR16L651
2.5V, 3.3V AND 5V LOW POWER UART WITH 32-BYTE FIFO
REV. P1.0.0
á
PRELIMINARY
20
5.10.3 Transmitter Operation in FIFO Mode
The host may fill the transmit FIFO with up to 32 bytes
of transmit data. The THR empty flag (LSR bit-5) is
set whenever the FIFO is empty. The THR empty flag
can generate a transmit empty interrupt (ISR bit-1)
when the amount of data in the FIFO falls below its
programmed trigger level (see TXTRG register). The
transmit empty interrupt is enabled by IER bit-1. The
TSR flag (LSR bit-6) is set when TSR/FIFO becomes
empty. Furthermore, with the RS485 half-duplex di-
rection control enabled (XFR bit-2 = 1), the source of
the transmit empty interrupt changes to TSR empty
instead of THR empty. This is to ensure the RTS#
output is not changed until the last stop bit of the last
character is shifted out.
5.10.4 Auto RS485 Half-duplex Control
The auto RS485 half-duplex direction control chang-
es the behavior of the transmitter when enabled by
XFR bit-2. It de-asserts RTS# output following
the
last stop bit of the last character that has been trans-
mitted. This helps in turning around the transceiver to
receive the remote station’s response. The auto
RS485 half-duplex direction contol also changes the
transmitter empty interrupt to TSR empty instead of
THR empty. When the host is ready to transmit next
polling data packet again, it only has to load data
bytes to the transmit FIFO. The transmitter automati-
cally re-asserts RTS# output prior sending the data.
F
IGURE
12. T
RANSMITTER
O
PERATION
IN
NON
-FIFO M
ODE
Transmit
Holding
Register
(THR)
Transmit Shift Register (TSR)
Data
Byte
L
S
B
M
S
B
THR Interrupt (ISR bit-1)
Enabled by IER bit-1
TXNOFIFO1
16X or 8X
Clock
(8XMODE
Register)
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