參數(shù)資料
型號(hào)： XR16V654DIV-0A-EB
廠商： Exar Corporation
文件頁數(shù)： 10/58頁
文件大小： 0K
描述： EVAL BOARD FOR XR16V654D 64LQFP
標(biāo)準(zhǔn)包裝： 1
系列： *
XR16V654/654D
18
2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO
REV. 1.0.1
2.9.2
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.
2.9.3
Transmitter Operation in FIFO Mode
The host may fill the transmit FIFO with up to 64 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
FIFO becomes empty. The transmit empty interrupt is enabled by IER bit-1. The TSR flag (LSR bit-6) is set
when TSR/FIFO becomes empty.
FIGURE 8. TRANSMITTER OPERATION IN NON-FIFO MODE
FIGURE 9. TRANSMITTER OPERATION IN FIFO AND FLOW CONTROL 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] )
Transmit Data Shift Register
(TSR)
Transmit
Data Byte
THR Interrupt (ISR bit-1) falls
below the programmed Trigger
Level and then when becomes
empty. FIFO is Enabled by FCR
bit-0=1
Transmit
FIFO
16X or 8X or 4X Clock
(DLD[5:4])
Auto CTS Flow Control (CTS# pin)
Auto Software Flow Control
Flow Control Characters
(Xoff1/2 and Xon1/2 Reg.)
TXFIFO1
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