参数资料
型号: SC16C550BIB48,151
厂商: NXP Semiconductors
文件页数: 15/48页
文件大小: 0K
描述: IC UART SINGLE W/FIFO 48-LQFP
产品培训模块: Stand-Alone UARTs
标准包装: 250
特点: 可编程
通道数: 1,UART
FIFO's: 16 字节
电源电压: 2.5V,3.3V,5V
带自动流量控制功能:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 托盘
产品目录页面: 827 (CN2011-ZH PDF)
其它名称: 568-2040
935274388151
SC16C550BIB48-S
SC16C550B_5
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 1 October 2008
22 of 48
NXP Semiconductors
SC16C550B
5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs
7.4 Interrupt Status Register (ISR)
The SC16C550B provides four levels of prioritized interrupts to minimize external software
interaction. The Interrupt Status Register (ISR) provides the user with four interrupt status
bits. Performing a read cycle on the ISR will provide the user with the highest pending
interrupt level to be serviced. No other interrupts are acknowledged until the pending
interrupt is serviced. Whenever the interrupt status register is read, the interrupt status is
cleared. However, it should be noted that only the current pending interrupt is cleared by
the read. A lower level interrupt may be seen after re-reading the interrupt status bits.
Table 13 “Interrupt source” shows the data values (bits 3:0) for the four prioritized interrupt
levels and the interrupt sources associated with each of these interrupt levels.
Table 12.
RX trigger levels
FCR[7]
FCR[6]
RX FIFO trigger level (bytes)
001
014
108
1114
Table 13.
Interrupt source
Priority
level
ISR[3]
ISR[2]
ISR[1]
ISR[0]
Source of the interrupt
1
0
1
0
LSR (Receiver Line Status Register)
2
0
1
0
RXRDY (Received Data Ready)
2
1
0
RXRDY (Receive Data time-out)
3
0
1
0
TXRDY (Transmitter Holding Register Empty)
4
0
MSR (Modem Status Register)
Table 14.
Interrupt Status Register bits description
Bit
Symbol
Description
7:6
ISR[7:6]
FIFOs enabled. These bits are set to a logic 0 when the FIFO is not
being used. They are set to a logic 1 when the FIFOs are enabled.
logic 0 or cleared = default condition
5:4
ISR[5:4]
not used
3:1
ISR[3:1]
INT priority bits 2:0. These bits indicate the source for a pending
interrupt at interrupt priority levels 1, 2, and 3 (see Table 13).
logic 0 or cleared = default condition
0
ISR[0]
INT status.
logic 0 = an interrupt is pending and the ISR contents may be used as
a pointer to the appropriate interrupt service routine
logic 1 = no interrupt pending (normal default condition)
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SC16C550BIBS 功能描述:UART 接口集成电路 16CB 2.5V-5V 1CH UART 16B FIFO 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
SC16C550BIBS,128 功能描述:UART 接口集成电路 16CB 2.5V-5V 1CH 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
SC16C550BIBS,151 功能描述:UART 接口集成电路 16CB 2.5V-5V 1CH 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
SC16C550BIBS,157 功能描述:UART 接口集成电路 16CB 2.5V-5V 1CH 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