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参数资料
| 型号： | XR16M654DIV64-F |
| 厂商： | Exar Corporation |
| 文件页数： | 13/58页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO 64B QUAD 64LQFP |
| 标准包装： | 160 |
| 特点： | * |
| 通道数： | 4，QUART |
| FIFO's： | 64 字节 |
| 规程： | RS232 |
| 电源电压： | 1.62 V ~ 3.63 V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（10x10） |
| 包装： | 托盘 |
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XR16M654/654D
20
1.62V TO 3.63V QUAD UART WITH 64-BYTE FIFO
REV. 1.0.0
2.11
Auto RTS (Hardware) Flow Control
Automatic RTS hardware flow control is used to prevent data overrun to the local receiver FIFO. The RTS#
output is used to request remote unit to suspend/resume data transmission. The auto RTS flow control
features is enabled to fit specific application requirement (see Figure 12):
Enable auto RTS flow control using EFR bit-6.
The auto RTS function must be started by asserting RTS# output pin (MCR bit-1 to logic 1 after it is enabled).
If using the Auto RTS interrupt:
Enable RTS interrupt through IER bit-6 (after setting EFR bit-4). The UART issues an interrupt when the RTS#
pin makes a transition from low to high: ISR bit-5 will be set to logic 1.
2.12
Auto RTS Hysteresis
The M654 has a new feature that provides flow control trigger hysteresis while maintaining compatibility with
the XR16C850, ST16C650A and ST16C550 family of UARTs. With the Auto RTS function enabled, an interrupt
is generated when the receive FIFO reaches the selected RX trigger level. The RTS# pin will not be forced
HIGH (RTS off) until the receive FIFO reaches one trigger level above the selected trigger level in the trigger
table (Table 12). The RTS# pin will return LOW after the RX FIFO is unloaded to one level below the selected
trigger level. Under the above described conditions, the M654 will continue to accept data until the receive
FIFO gets full. The Auto RTS function is initiated when the RTS# output pin is asserted LOW (RTS On).
FIGURE 11. RECEIVER OPERATION IN FIFO AND AUTO RTS FLOW CONTROL MODE
TABLE 7: AUTO RTS (HARDWARE) FLOW CONTROL
RX TRIGGER LEVEL
INT PIN ACTIVATION
RTS# DE-ASSERTED (HIGH)
(CHARACTERS IN RX FIFO)
RTS# ASSERTED (LOW)
(CHARACTERS IN RX FIFO)
8
16
0
16
56
8
56
60
16
60
56
Rece ive Da ta S hift
R egister (R S R )
R X FIFO 1
16X or 8X o r 4X C lock
( DLD[5:4] )
Err
o
rT
a
g
s
(64
-s
e
ts)
Er
ro
rT
a
g
s
i
n
LS
R
b
its
4:
2
R ece ive D ata C haracte rs
D a ta B it
V alidation
Receive
D ata FIF O
Receive
Data
Rece ive Da ta
B yte and E rrors
R H R Interrupt (IS R bit-2 ) prog ram m ed for
de sired FIFO trigger level.
FIFO is E nab led by F C R b it-0=1
R TS # de -asserts w hen data fills abo ve the flo w
con trol trig ger le vel to su spend rem o te tran sm itter.
E na ble by E FR b it-6=1, M C R bit-1.
R TS# re-asserts w he n data falls be low the flow
contro l trigge r level to resta rt rem o te tran sm itter.
E na ble by E FR b it-6=1, M C R bit-1.
64 bytes by 11-bit w ide
FIFO
Trigger=16
D ata falls to
8
D ata fills to
56
E xam ple
: - R X FIFO trigger level selected at 16 bytes
(See N ote Below )
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相关代理商/技术参数 |
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|---|---|
| XR16M654DIV64TR-F | 制造商:Exar Corporation 功能描述:UART 4-CH 64Byte FIFO 1.8V/2.5V/3.3V 64-Pin LQFP T/R |
| XR16M654IJ-0A-EVB | 功能描述:界面开发工具 Eval Board for XR16M654IJ-0A RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR16M654IJ-0B-EVB | 功能描述:界面开发工具 Eval Board for XR16M654IJ-0B RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR16M654IJ68 | 制造商:EXAR 制造商全称:EXAR 功能描述:1.62V TO 3.63V QUAD UART WITH 64-BYTE FIFO |
| XR16M654IJ68-F | 功能描述:UART 接口集成电路 UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
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