SC28L202 datasheet(34/77 Pages) PHILIPS

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Philips Semiconductors

Objective specification

SC28L202

Dual UART

2000 Feb 10

• 10111 Host Xoff (or transmitter pause) command (CRTXoff). This

command allows tight host CPU control of the flow control of the

channel transmitter. When interrupted for receipt of a Xoff

character by the receiver, the host may stop transmission of

further characters by the channel transmitter by issuing the Host

Xoff command. Any character that has been transferred to the

TxD shift register will complete its transmission, including the stop

bit before the transmitter pauses. Even though the transmitter is

paused it is still able to send Xon/Xoff by the request of its

associated receiver.

• 11000 Cancel Host transmit flow control command. Issuing this

command will cancel a previous command to transmit a flow

control character if the flow control character is not yet loaded into

the TxD Shift Register. If there is no character waiting for

transmission or if its transmission has already begun, then this

command has no effect and the character will be sent.

• 11001 Reserved

• 11010 Reserved

• 11011 Reset Address Recognition Status. This command clears

the interrupt status that was set when an address character was

recognized by a disabled receiver operating in the special mode.

• 11100 Reserved

• 11101 Block error status accumulates on FIFO read (Default

State)

• 11110 Reset to “C92” Register Set

• 11111 Reserved for channel B, for channel A: executes a chip

wide reset. Executing this command in channel a is equivalent to

a hardware reset with the RESET(N) pin. Executing in channel B

has no effect.

COMMAND REGISTER EXTENSION TABLE A and B

Commands 0x0F, 0x0F, 0xFF (marked with * ) are global and exist only in channel A’s register space.

Channel

Command

Code

Channel

Command

Channel

Command Code

Channel

Command

CR[4:0]

Description

CR[4:0]

Description

0 0000

NOP

1 0000

Transmit Xon

0 0001

Set MR pointer to 1

1 0001

Transmit Xoff

0 0010

Reset Receiver

1 0010

Start C/T

0 0011

Reset Transmitter

1 0011

Stop C/T

0 0100

Reset Error Status

1 0100

Reserved

0 0101

Reset Break Change Interrupt

1 0101

Reserved

0 0110

Begin Transmit Break

1 0110

Transmitter Resume Command (CRXoffRe)

0 0111

End Transmit Break

1 0111

Host Xoff Command (CRTXoff)

0 1000

Assert RTSN (I/O0 B or I/O1 B)

1 1000

Cancel Transmit X Char Command (CRTX)

0 1001

Negate RTSN (I/O0 B or I/O1 B)

1 1001

Reserved

0 1010

Set C/T Receiver time–out mode on

1 1010

Reserved

0 1011

Set MR pointer to 0

1 1011

Reset Address Recognition Status

0 1100

Set C/T Receiver time–out mode off

1 1100

Reserved

0 1101

Block Error Status on RxFIFO load

1 1101

Block Error Status on RxFIFO Read

0 1110

• Power Down Mode On

1 1110

Reserved

0 1111

• Disable Power Down Mode

1 1111

• Reset Device as a Hardware reset. Reserved in channel B*

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