TUSB5052 datasheet(55/82 Pages) TI

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7−7

7.1.7

MSR[2:1]: Modem-Status Registers (2 Registers)

These registers provide information about the current state of the control lines from the modem.

LCD

LRI

LDSR

LCTS

∆CD

TRI

∆DSR

∆CTS

R/O

R/C

BIT

NAME

RESET

FUNCTION

∆CTS

This bit indicates that CTS input has changed state.

∆CTS = 0 Indicates no change in CTS input.

∆CTS = 1 Indicates that CTS input has changed state since the last time it was read. Clears when the MCU writes

a 1. Writing a 0 has no effect.

∆DSR

This bit indicates that DSR input has changed state.

∆DSR = 0 Indicates no change in DSR input.

∆DSR = 1 Indicates that DSR input has changed state since the last time it was read. Clears when the MCU writes

a 1. Writing a 0 has no effect.

TRI

Trailing edge of the ring-indicator. This bit indicates that RI input has changed from low to high level.

RI = 0

Indicates that RI input is high.

RI = 1

Indicates that a transition from low to high level has occurred on RI input. Clears when the MCU writes a

1. Writing a 0 has no effect.

∆CD

This bit indicates that CD input has changed state.

∆DC = 0 Indicates no change in CD input.

∆DC = 1 Indicates that CD input has changed state since the last time it was read. Clears when the MCU writes

a 1. Writing a 0 has no effect.

LCTS

During loopback, this bit reflects the status of MCR[5] (see Figure 7−1).

LCTS = 0 CTS input is high

LCTS = 1 CTS input is low

LDSR

During loopback, this bit reflects the status of MCR[4] (see Figure 7−1).

LDSR = 0 DSR input is high

LDSR = 1 DSR input is low

LRI

During loopback, this bit reflects the status of MCR[6] (see Figure 7−1).

LRI = 0

RI input is high

LRI = 1

RI input is low

LCD

During loopback, this bit reflects the status of MCR[7] (see Figure 7−1).

LCD = 0

CD input is high

LCD = 1

CD input is low

7.1.8

DLL[2:1]: Divisor Low-Byte Registers (2 Registers)

These registers contain the low-byte of the baud-rate divisor. The 1.8462-MHz clock is derived from the 48-MHz clock

(dividing by 26). This clock is used for the baud-rate calculation (see Baud-Rate table)

R/W

BIT

NAME

RESET

FUNCTION

7−0

D[7:0]

08h

Low-byte value of the 16-bit divisor for generation of the baud clock in the baud-rate generator.

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