參數(shù)資料
型號(hào)： XR16C854IJ-F
廠商： Exar Corporation
文件頁數(shù)： 8/53頁
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
16
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 3.1.0
2.12.1
Receive Holding Register (RHR) - Read-Only
The Receive Holding Register is an 8-bit register that holds a receive data byte from the Receive Shift
Register. It provides the receive data interface to the host processor. The RHR register is part of the receive
FIFO of 128 bytes by 11-bits wide, the 3 extra bits are for the 3 error tags to be reported in LSR register. When
the FIFO is enabled by FCR bit-0, the RHR contains the first data character received by the FIFO. After the
RHR is read, the next character byte is loaded into the RHR and the errors associated with the current data
byte are immediately updated in the LSR bits 2-4.
NOTE: Table-B selected as Trigger Table for
Figure 10 (Table 11).
FIGURE 9. RECEIVER OPERATION IN NON-FIFO MODE
FIGURE 10. RECEIVER OPERATION IN FIFO AND AUTO RTS FLOW CONTROL MODE
Receive Data Shift
Register (RSR)
Receive
Data Byte
and Errors
RHR Interrupt (ISR bit-2)
Receive Data
Holding Register
(RHR)
RXFIFO1
16X Clock
Receive Data Characters
Data Bit
Validation
Error
Tags in
LSR bits
4:2
Receive Data Shift
Register (RSR)
RXFIFO1
16X Clock
E
rr
o
r
T
a
g
s
(1
2
8
-s
e
ts
)
E
rr
o
r
T
a
g
s
in
L
S
R
b
it
s
4
:2
128 bytes by 11-bit
wide FIFO
Receive Data Characters
FIFO
Trigger=16
Example
:
- RX FIFO trigger level selected at 16
bytes
(See Note Below)
Data fills to
24
Data falls to
8
Data Bit
Validation
Receive
Data FIFO
Receive
Data
Receive Data
Byte and Errors
RHR Interrupt (ISR bit-2) programmed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
RTS# re-asserts when data falls below the flow
control trigger level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
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