SC16C650BIBS PHILIPS [NXP Semiconductors], SC16C650BIBS Datasheet - Page 28

• Manufacturer Part Number: SC16C650BIBS
• Description: 5 V, 3.3 V and 2.5 V UART with 32-byte FIFOs and infrared (IrDA) encoder/decoder
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
9397 750 14451
Product data
7.8 Modem Status Register (MSR)
Table 20:
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.
Table 21:
Bit
0
Bit
7
6
5
4
3
2
Symbol
LSR[0]
Symbol
MSR[7]
MSR[6]
MSR[5]
MSR[4]
MSR[3]
MSR[2]
Line Status Register bits description
Modem Status Register bits description
Rev. 03 — 10 December 2004
Description
Receive data ready.
Description
Data Carrier Detect. DCD (Active-HIGH, logical 1). Normally this bit is
the complement of the DCD input. In the loop-back mode this bit is
equivalent to the OUT2 bit in the MCR register.
Ring Indicator. RI (Active-HIGH, logical 1). Normally this bit is the
complement of the RI input. In the loop-back mode this bit is equivalent
to the OUT1 bit in the MCR register.
Data Set Ready. DSR (Active-HIGH, logical 1). Normally this bit is the
complement of the DSR input. In loop-back mode this bit is equivalent to
the DTR bit in the MCR register.
Clear To Send. CTS. CTS functions as hardware flow 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 finished transmission. Normally MSR[4] is
the complement of the CTS input. However, in the loop-back mode, this
bit is equivalent to the RTS bit in the MCR register.
DCD
RI
Logic 0 = No data in receive holding register or FIFO (normal default
condition).
Logic 1 = Data has been received and is saved in the receive holding
register or FIFO.
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.
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]
[1]
UART with 32-byte FIFOs and IrDA encoder/decoder
…continued
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
SC16C650B
28 of 51