SC68C752BIBS,151 NXP Semiconductors, SC68C752BIBS,151 Datasheet - Page 26

• Manufacturer Part Number: SC68C752BIBS,151
• Description: IC UART DUAL W/FIFO 32-HVQFN
• Manufacturer: NXP Semiconductors

Specifications of SC68C752BIBS,151

• Number Of Channels: 2, DUART
• Fifo's: 64 Byte
• Voltage - Supply: 2.5V, 3.3V, 5V
• With Auto Flow Control: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-3299; 935280969151; SC68C752BIBS-S

NXP Semiconductors
SC68C752B_4
Product data sheet
7.7 Modem Status Register (MSR)
This 8-bit register provides information about the current state of the control lines from the
mode, data set, or peripheral device to the processor. It also indicates when a control
input from the modem changes state.
per channel.
Table 16.
[1]
Bit
7
6
5
4
3
2
1
0
The primary inputs RIn, CDn, CTSn, DSRn are all active LOW, but their registered equivalents in the MSR
and MCR (in Loopback mode) registers are active HIGH.
Symbol
MSR[7]
MSR[6]
MSR[5]
MSR[4]
MSR[3]
MSR[2]
MSR[1]
MSR[0]
Modem Status Register bits description
[1]
[1]
[1]
[1]
Description
CD (active HIGH, logic 1). This bit is the complement of the CDn input during
normal mode. During internal Loopback mode, it is equivalent to the state of
MCR[3].
RI (active HIGH, logic 1). This bit is the complement of the RIn input during
normal mode. During internal Loopback mode, it is equivalent to the state of
MCR[2].
DSR (active HIGH, logic 1). This bit is the complement of the DSRn input
during normal mode. During internal Loopback mode, it is equivalent to the
state of MCR[0].
CTS (active HIGH, logic 1). This bit is the complement of the CTSn input
during normal mode. During internal Loopback mode, it is equivalent to the
state of MCR[1].
ΔCD. Indicates that CDn input (or MCR[3] in Loopback mode) has changed
state. Cleared on a read.
ΔRI. Indicates that RIn input (or MCR[2] in Loopback mode) has changed
state from LOW to HIGH. Cleared on a read.
ΔDSR. Indicates that DSRn input (or MCR[0] in Loopback mode) has changed
state. Cleared on a read.
ΔCTS. Indicates that CTSn input (or MCR[1] in Loopback mode) has changed
state. Cleared on a read.
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
Rev. 04 — 20 January 2010
Table 16
shows Modem Status Register bit settings
SC68C752B
© NXP B.V. 2010. All rights reserved.
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