CX06833-3 查看數據表（PDF） - Conexant Systems

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CX06833-3

SMXXD Modem

Conexant Systems 

5.3.2

5.4

5.4.1

CX06833-3x/4x SMXXD Modem Data Sheet

Receiver Character Timeout Interrupts

When the FIFO mode is enabled (FCR0 = 1) and receiver interrupt (Receiver Data

Available) is enabled (IER0 = 1), receiver character timeout interrupt operation is as

follows:

1. A Receiver character timeout interrupt code (IIR0-IIR3 = Ch) is set if at least one

received character is in the RX FIFO, the most recent received serial character was

longer than four continuous character times ago (if 2 stop bits are specified, the

second stop bit is included in this time period), and the most recent host read of the

RX FIFO was longer than four continuous character times ago.

Transmitter FIFO Interrupt Operation

Transmitter Empty Interrupt

When the FIFO mode is enabled (FCR0 = 1) and transmitter interrupt (TX Buffer Empty)

is enabled (IER0 = 1), transmitter interrupt operation is as follows:

1. The TX Buffer Empty interrupt code (IIR0-IIR3 = 2h) will occur when the TX

Buffer is empty; it is cleared when the TX Buffer is written to (1 to 16 characters) or

the IIR is read.

2. The TX Buffer Empty indications will be delayed 1 character time minus the last

stop bit time whenever the following occur: THRE = 1 and there have not been at

least two bytes at the same time in the TX FIFO Buffer since the last setting of

THRE was set. The first transmitter interrupt after setting FCR0 will be immediate.

102228A

Conexant

5-11

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