SCD1284 datasheet(124/176 Pages) INTEL

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CD1284 — IEEE 1284-Compatible Parallel Interface Controller

124

Datasheet

7.4.2

Channel Option Register 2

Ignore Parity: If this bit is set, the CD1284 ignores the parity on all incoming characters, thus no receive

exception service requests are generated if the parity is in error. If the bit is cleared, parity is evaluated.

3:2

Stop Bit Length: These two bits set the length, in bit times, of the Stop bit for each character.

1:0

Character Length: ChL1 and ChL0 select the length of each character, in number of bits. The CD1284

receives and transmits the same length character, on a given channel, in the range of five to eight bits.

Access: Read/Write

8-Bit Hex Address: 09

Default Value: 00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

IXM

TxIBE

ETC

LLM

RLM

RtsAO

CtsAE

DsrAE

Bit

Description

Implied XON mode: This bit enables the automatic resumption of character transmission upon the reception

of any character. This bit only has meaning if the transmitter is in Automatic In-band Flow-control mode as

programmed by the TxIBE control bit. When this bit is reset and TxIBE is enabled, the reception of any

character restarts character transmission.

Enable Automatic In-band Transmit Flow Control: This bit allows the CD1284 to examine error-free

incoming characters looking for an XOFF character (as programmed by SCHR2), if the special character

match function is enabled (COR3[4]). If a match occurs, transmission ceases after the current characters in

the Transmitter Shift register and Transmitter Holding register are sent. Transmission resumes when an XON

character (or any character, depending on the value of the IXM bit) is received or if a channel enable

command is issued by the CCR.

Embedded Transmit Command Enable: If the ETC bit is set, the CD1284 examines characters in the

transmit FIFO. If an embedded command is detected, it is processed. See the embedded transmit command

description in Chapter 5.0 for details of valid commands.

Bit

Description

Stop1

Stop0

Number of Stop Bits

1.5

Not used.

ChL1

ChL0

Character Length

5 bits

6 bits

7 bits

8 bits

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