SC16C652BIB48,157 NXP Semiconductors, SC16C652BIB48,157 Datasheet - Page 24

• Manufacturer Part Number: SC16C652BIB48,157
• Description: IC ENCODER/DECODER IRDA 48LQFP
• Manufacturer: NXP Semiconductors

Specifications of SC16C652BIB48,157

• Features: 2 Channels
• Number Of Channels: 2, DUART
• Fifo's: 32 Byte
• Voltage - Supply: 2.5V, 3.3V, 5V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• With Cmos: Yes
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935274409157; SC16C652BIB48; SC16C652BIB48

Philips Semiconductors
SC16C652B_4
Product data sheet
7.8 Modem Status Register (MSR)
7.9 Scratchpad Register (SPR)
This register provides the current state of the control interface signals from the modem, or
other peripheral device to which the SC16C652B 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.
Table 22:
[1]
The SC16C652B provides a temporary data register to store 8 bits of user information.
Bit
7
6
5
4
3
2
1
0
Whenever any MSR bit 3:0 is set to logic 1, a Modem Status Interrupt will be generated.
Symbol
MSR[7]
MSR[6]
MSR[5]
MSR[4]
MSR[3]
MSR[2]
MSR[1]
MSR[0]
Modem Status Register bits description
Description
CD. During normal operation, this bit is the complement of the CD input.
Reading this bit in the loop-back mode produces the state of MCR[3] (OP2).
RI. During normal operation, this bit is the complement of the RI input.
Reading this bit in the loop-back mode produces the state of MCR[2] (OP1).
DSR. During normal operation, this bit is the complement of the DSR input.
During the loop-back mode, this bit is equivalent to MCR[0] (DTR).
CTS. During normal operation, this bit is the complement of the CTS input.
During the loop-back mode, this bit is equivalent to MCR[1] (RTS).
Rev. 04 — 1 September 2005
CD
RI
DSR
CTS
logic 0 = no CD change (normal default condition)
logic 1 = the CD input to the SC16C652B has changed state since the
last time it was read. A modem Status Interrupt will be generated.
logic 0 = no RI change (normal default condition)
logic 1 = the RI input to the SC16C652B has changed from a logic 0 to a
logic 1. A modem Status Interrupt will be generated.
logic 0 = no DSR change (normal default condition)
logic 1 = the DSR input to the SC16C652B has changed state since the
last time it was read. A modem Status Interrupt will be generated.
logic 0 = no CTS change (normal default condition)
logic 1 = the CTS input to the SC16C652B has changed state since the
last time it was read. A modem Status Interrupt will be generated.
[1]
[1]
[1]
[1]
Dual UART with 32-byte FIFOs and IrDA encoder/decoder
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
SC16C652B
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