参数资料
| 型号： | SC16C650BIB48,128 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 19/48页 |
| 文件大小： | 0K |
| 描述： | IC UART SOT313-2 |
| 标准包装： | 2,000 |
| 通道数： | 1，UART |
| FIFO's： | 32 字节 |
| 电源电压： | 2.5V，3.3V，5V |
| 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： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
| 其它名称： | 935274391128 SC16C650BIB48-F SC16C650BIB48-F-ND |
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SC16C650B_4
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 14 September 2009
26 of 48
NXP Semiconductors
SC16C650B
UART with 32-byte FIFOs and IrDA encoder/decoder
7.8 Modem Status Register (MSR)
This register provides the current state of the control interface signals from the modem, or
other peripheral device to which the SC16C650B is connected. Four bits of this register
are used to indicate the changed information. These bits are set to a logic 1 whenever a
control input from the modem changes state. These bits are set to a logic 0 whenever the
CPU reads this register.
[1]
Whenever any MSR bit 3:0 is set to logic 1, a Modem Status Interrupt will be generated.
Table 21.
Modem Status Register bits description
Bit
Symbol
Description
7
MSR[7]
Data Carrier Detect. DCD (active HIGH, logic 1). Normally this bit is the
complement of the DCD input. In the loopback mode this bit is equivalent to the
OUT2 bit in the MCR register.
6
MSR[6]
Ring Indicator. RI (active HIGH, logic 1). Normally this bit is the complement of
the RI input. In the loopback mode this bit is equivalent to the OUT1 bit in the
MCR register.
5
MSR[5]
Data Set Ready. DSR (active HIGH, logic 1). Normally this bit is the
complement of the DSR input. In loopback mode this bit is equivalent to the
DTR bit in the MCR register.
4
MSR[4]
Clear To Send. CTS. CTS functions as hardware ow control signal input if it is
enabled via EFR[7]. Flow control (when enabled) allows starting and stopping
the transmissions based on the external modem CTS signal. A logic 1 at the
CTS pin will stop SC16C650B transmissions as soon as current character has
nished transmission. Normally MSR[4] is the complement of the CTS input.
However, in the loopback mode, this bit is equivalent to the RTS bit in the MCR
register.
3
MSR[3]
DCD [1]
logic 0 = no DCD change (normal default condition)
logic 1 = the DCD input to the SC16C650B has changed state since the last
time it was read. A modem Status Interrupt will be generated.
2
MSR[2]
RI [1]
logic 0 = no RI change (normal default condition)
logic 1 = the RI input to the SC16C650B has changed from a logic 0 to a
logic 1. A modem Status Interrupt will be generated.
1
MSR[1]
DSR [1]
logic 0 = no DSR change (normal default condition)
logic 1 = the DSR input to the SC16C650B has changed state since the last
time it was read. A modem Status Interrupt will be generated.
0
MSR[0]
CTS [1]
logic 0 = no CTS change (normal default condition)
logic 1 = the CTS input to the SC16C650B has changed state since the last
time it was read. A modem Status Interrupt will be generated.
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