SAA7780 datasheet(20/70 Pages) PHILIPS

20 / 70 page

ThunderBird Q3D PCI Audio

SAA7780

Accelerator

Philips Semiconductors

Product Specification

1999 Sep 30

16650 UART Interface

RXD

146

I-T

UART Serial Data Input

This pin provides the serial bit stream to the 550-compatible UART.

This input is ignored when the Loop Mode is enabled.

TXD

145

O-T

UART Serial Data Output

This pin is an output from UART, providing the serial bit stream to

external buffers or devices. This signal is forced high whenever the

transmitter is disabled, RST# is asserted, the transmit register is

empty, or the UART is in the Loop Mode.

RTS#

148

O-T

UART Request To Send

An active low output that is the inverted value of the Modem Control

When MCR[1] = 1, RTS# is low.

When MCR[1] = 0, RTS# is high.

When RST# is asserted, RTS# is forced high.

DTR#

149

O-T

UART Data Terminal Ready

An active low output that is the inverted value of the Modem Control

When MCR[0] = 1, DTR# is low.

When MCR[0] = 0, DTR# is high.

When RST# is asserted, DTR# is forced high.

CTS#

150

I-T

UART Clear To Send

The status of this input can be determined by reading bit 4 of the

Modem Status Register. When MSR[4] is read, it will be the inverted

value of CTS#. A change in status of CTS# sets the Delta CTS bit in

the Modem Status Register.

If the CTS# line changes state while the modem status interrupts

are enabled, an interrupt packet will be generated.

DSR#

151

I-T

UART Data Set Ready

The status of this input can be determined by reading bit 5 of the

Modem Status Register. When MSR[5] is read, it will be the inverted

value of DSR#. A change in status of DSR# sets the Delta DSR bit

in the Modem Status Register.

If the DSR# line changes state while the modem status interrupts

are enabled, an interrupt will be generated.

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