REV. 1.0.1 1.62V TO 3.63V UART WITH 32-BYTE FIFO AND VLIO INTERFACE 2.8 Transmitter The transmitter section comprises" />
參數(shù)資料
型號(hào)： XR16M681IB25-0C-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 5/51頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR16M681-C 25BGA,
標(biāo)準(zhǔn)包裝： 1
系列： *
XR16M681
13
REV. 1.0.1
1.62V TO 3.63V UART WITH 32-BYTE FIFO AND VLIO INTERFACE
2.8
Transmitter
The transmitter section comprises of an 8-bit Transmit Shift Register (TSR) and 32 bytes of FIFO which
includes a byte-wide Transmit Holding Register (THR). TSR shifts out every data bit with the 16X/8X/4X
internal clock. A bit time is 16/8/4 clock periods. The transmitter sends the start-bit followed by the number of
data bits, inserts the proper parity-bit if enabled, and adds the stop-bit(s). The status of the FIFO and TSR are
reported in the Line Status Register (LSR bit-5 and bit-6).
2.8.1
Transmit Holding Register (THR) - Write Only
The transmit holding register is an 8-bit register providing a data interface to the host processor. The host
writes transmit data byte to the THR to be converted into a serial data stream including start-bit, data bits,
parity-bit and stop-bit(s). The least-significant-bit (Bit-0) becomes first data bit to go out. The THR is the input
register to the transmit FIFO of 32 bytes when FIFO operation is enabled by FCR bit-0. Every time a write
operation is made to the THR, the FIFO data pointer is automatically bumped to the next sequential data
location.
2.8.2
Transmitter Operation in non-FIFO Mode
The host loads transmit data to THR one character at a time. The THR empty flag (LSR bit-5) is set when the
data byte is transferred to TSR. THR flag can generate a transmit empty interrupt (ISR bit-1) when it is enabled
by IER bit-1. The TSR flag (LSR bit-6) is set when TSR becomes completely empty.
FIGURE 8. TRANSMITTER OPERATION IN NON-FIFO MODE
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 or 4X
Clock
( DLD[5:4] )
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XR16M681IL24 制造商:EXAR 制造商全稱:EXAR 功能描述:1.62V TO 3.63V UART WITH 32-BYTE FIFO AND VLIO INTERFACE
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XR16M681IL32 制造商:EXAR 制造商全稱:EXAR 功能描述:1.62V TO 3.63V UART WITH 32-BYTE FIFO AND VLIO INTERFACE
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