SC28L201A1DGG,118 NXP Semiconductors, SC28L201A1DGG,118 Datasheet - Page 62

• Manufacturer Part Number: SC28L201A1DGG,118
• Description: IC UART W/FIFO 48-TSSOP
• Manufacturer: NXP Semiconductors
• Series: IMPACTr

Specifications of SC28L201A1DGG,118

• Features: False-start Bit Detection
• Number Of Channels: 2, DUART
• Fifo's: 256 Byte
• Voltage - Supply: 3.3V, 5V
• With Parallel Port: Yes
• With Auto Flow Control: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• With Cmos: Yes
• Mounting Type: Surface Mount
• Package / Case: 48-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935277824118; SC28L201A1DGG-T; SC28L201A1DGG-T

Philips Semiconductors
9397 750 13138
Product data sheet
8.3.4 Xon/Xoff Interrupt Status Register (XISR)
Reading this register clears XISR[7:4].
Table 36:
Bit
7:6
5:4
3:2
1:0
Symbol
XISR - Xon/Xoff Interrupt Status Register (address 0x44) bit description
Description
Received X Character Status.
This field can be read to determine if the receiver has encountered an Xon
or Xoff character in the incoming data stream. These bits are maintained
until a read of the XISR. The field is updated by X character reception
regardless of the state of MR3[7] and MR3[3:2] or IMR[4]. The field can
therefore be used as a character detector for the bit patterns stored in the
Xon and Xoff Character Registers.
Automatic X Character transmission status.
This field indicates the last flow control character sent in the Auto Receiver
flow control mode. If Auto Receiver mode has not been enabled, this field
will always read 00. It will likewise reset to ‘00’ if MR0[3] is reset. If the Auto
Receiver mode is exited while this field reads ‘10’, it is the user’s
responsibility to transmit an Xon, when appropriate.
TXD flow status. TXD condition of the automatic flow control status.
This field tracks the transmitter’s flow status as follows:
After a read of the XISR, it will return to ‘normal’ status.
TXD X Character Status.
Conditions ‘10’ and ‘11’ will not exist for more than a character time.
Rev. 01 — 31 October 2005
00 = none
01 = Xoff received
10 = Xon received
11 = both received
00 = none
01 = Xon transmitted
10 = Xoff transmitted
11 = both transmitted
00 = normal transmission. Transmitter is not affected by Xon or Xoff.
01 = TXD halt pending. After the current character finishes the transmitter
will stop. The status will then change to ‘11’.
10 = re-enabled. The transmitter had been halted and has been
re-started. It is sending (or is prepared to send) data characters.
11 = flow halted. The Transmitter is stopped due to an Xoff character
being received from its associated receiver. The transmitter is ‘flow
controlled’.
00 = normal TXD data.
01 = Idle wait for FIFO data. The character is waiting for a data character
to transfer from the TxFIFO. This condition will only occur for a bit time
after an Xon or Xoff character transmission unless the TxFIFO is empty
10 = Xoff is pending. A command to send an Xoff character is pending.
11 = Xon is pending. A command to send an Xon character is pending.
3.3 V, 5 V UART, 3.125 Mbit/s, with 256-byte FIFO
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
SC28L201
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