參數(shù)資料
型號(hào)： XR16C854IJ-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 7/53頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO 128B QUAD 68PLCC
標(biāo)準(zhǔn)包裝： 19
特點(diǎn)： *
通道數(shù)： 4，QUART
FIFO's： 128 字節(jié)
規(guī)程： RS232，RS485
電源電壓： 2.97 V ~ 5.5 V
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 68-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 68-PLCC
包裝： 管件
其它名稱： XR16C854IJ-F-ND
XR16C854/854D
15
REV. 3.1.0
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.11.3
Transmitter Operation in FIFO Mode
The host may fill the transmit FIFO with up to 128 bytes of transmit data. The THR empty flag (LSR bit-5) is set
whenever the TX 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/TX FIFO becomes empty.
2.12
Receiver
The receiver section contains an 8-bit Receive Shift Register (RSR) and 128 bytes of FIFO which includes a
byte-wide Receive Holding Register (RHR). The RSR uses the 16X clock for timing. It verifies and validates
every bit on the incoming character in the middle of each data bit. On the falling edge of a start or false start bit,
an internal receiver counter starts counting at the 16X clock rate. After 8 clocks the start bit period should be at
the center of the start bit. At this time the start bit is sampled and if it is still a logic 0 it is validated. Evaluating
the start bit in this manner prevents the receiver from assembling a false character. The rest of the data bits
and stop bits are sampled and validated in this same manner to prevent false framing. If there were any
error(s), they are reported in the LSR register bits 2-4. Upon unloading the receive data byte from RHR, the
receive FIFO pointer is bumped and the error tags are immediately updated to reflect the status of the data
byte in RHR register. RHR can generate a receive data ready interrupt upon receiving a character or delay until
it reaches the FIFO trigger level. Furthermore, data delivery to the host is guaranteed by a receive data ready
time-out interrupt when data is not received for 4 word lengths as defined by LCR[1:0] plus 12 bits time. This is
equivalent to 3.7-4.6 character times. The RHR interrupt is enabled by IER bit-0.
FIGURE 7. TRANSMITTER OPERATION IN NON-FIFO MODE
FIGURE 8. TRANSMITTER OPERATION IN FIFO AND FLOW CONTROL MODE
Transm it
Holding
Register
(THR)
Transm it S hift Register (TS R)
Data
Byte
L
S
B
M
S
B
THR Interrupt (IS R bit-1)
Enabled by IE R bit-1
TXN O FIFO1
16X
Clock
Transm it Data Shift Register
(TS R)
Data Byte
THR Interrupt (IS R bit-1) falls
below the program m ed Trigger
Level and then when becom es
em pty. FIFO is Enabled by FCR
bit-0=1
RX FIFO
16X Clock
Auto CTS Flow Control (CTS # pin)
A uto Software Flow Control
Flow Control Characters
(Xoff1/2 and Xon1/2 Reg.
T XF IF O 1
T HR
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