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參數(shù)資料
| 型號： | XR16C854IQ |
| 廠商： | EXAR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO |
| 中文描述： | 4 CHANNEL(S), 2M bps, SERIAL COMM CONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 14/51頁 |
| 文件大?。?/td> | 476K |
| 代理商： | XR16C854IQ |
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XR16C854
14
Rev. 1.00P
operation or to external MIDI oscillator for MIDI appli-
cations. A separate register is provided for monitoring
the real time status of the FIFO signals -TXRDY and
-RXRDY for each of the four UART channels (A-D).
This reduces polling time involved in accessing indi-
vidual channels. The 100 pin QFP package also
offers, four separate IrDA (Infrared Data Association
Standard) outputs for Infrared applications. These
outputs are provided in addition to the standard asyn-
chronous modem data outputs.
FUNCTIONAL DESCRIPTIONS
Interface Options
Two user interface modes are selectable for the 854
package. These interface modes are designated as
the 16 mode and the 68 mode. This nomenclature
corresponds to the early 16C554/654 and 68C554/
654 package interfaces respectively.
The 16 Mode Interface
The 16 mode configures the package interface pins for
connection as a standard 16 series (Intel) device and
operates similar to the standard CPU interface avail-
able on the 16C554/654. In the 16 mode (pin 16/-68
logic 1) each UART is selected with individual chip
select (CSx) pins as shown in Table 2 below.
Table 2, SERIAL PORT CHANNEL SELECTION
GUIDE, 16 MODE INTERFACE
-CSA
-CSB
-CSC
-CSD
UART
CHANNEL
1
0
1
1
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
0
None
A
B
C
D
The 68 Mode Interface
The 68 mode configures the package interface pins for
connection with Motorola, and other popular micro-
processor bus types. The interface operates similar to
the 68C554/654. In this mode the 854 decodes two
additional addresses, A3-A4 to select one of the four
UART ports. The A3-A4 address decode function is
used only when in the 68 mode (16/-68 logic 0), and is
shown in Table 3 below.
Table 3, SERIAL PORT CHANNEL SELECTION
GUIDE, 68 MODE INTERFACE
-CS
A4
A3
UART
CHANNEL
1
0
0
0
0
N/A
0
0
1
1
N/A
0
1
0
1
None
A
B
C
D
Internal Registers
The 854 provides 15 (64/68 pin packages) or 16 (100
pin packages) internal registers for monitoring and
control. These resisters are shown in Table 4 below.
Twelve registers are similar to those already available
in the standard 16C554. These registers function as
data holding registers (THR/RHR), interrupt status
and control registers (IER/ISR), a FIFO control regis-
ter (FCR), line status and control registers (LCR/LSR),
modem status and control registers (MCR/MSR), pro-
grammable data rate (clock) control registers (DLL/
DLM), and a user assessable scratchpad register
(SPR). Beyond the general 16C554 features and
capabilities, the 854 offers an enhanced feature reg-
ister set (EFR, Xon/Xoff 1-2) that provides on board
hardware/software flow control. Register functions
are more fully described in the following paragraphs.
相關PDF資料 |
PDF描述 |
|---|---|
| XR16C854IV | APH97-3108A20-29S |
| XR16C854D | 2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO |
| XR16C864 | Quad UART with RX/TX FIFO Counters and 128-byte FIFO(四通用異步接收器/發(fā)送器（帶RX/TX 先進先出計數(shù)器和128字節(jié)先進先出）) |
| XR16C872 | Dual UART with 1284 Parallel Port and Plug-and-Play（PnP） Controller(雙通用異步接收器/發(fā)送器（帶1284雙向并行端口和即插即用控制器）) |
| XR16L2450 | 2.25V TO 5.5V DUART |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XR16C854IQ-F | 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| XR16C854IQTR-F | 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| XR16C854IV | 制造商:Exar Corporation 功能描述: |
| XR16C854IV-F | 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| XR16C854IV-F | 制造商:Exar Corporation 功能描述:IC QUAD UART 2MBPS 5.5V 64-LQFP |
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