SC28L201A1DGG,112 NXP Semiconductors, SC28L201A1DGG,112 Datasheet - Page 36

• Manufacturer Part Number: SC28L201A1DGG,112
• Description: IC UART W/FIFO 48-TSSOP
• Manufacturer: NXP Semiconductors
• Series: IMPACTr

Specifications of SC28L201A1DGG,112

• 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: 568-3293-5; 935277824112; SC28L201A1DGG

Philips Semiconductors
9397 750 13138
Product data sheet
7.4.10.7 Xon/Xoff interrupts
7.4.10.8 Multi-drop, Wake-up, or 9-bit mode
7.5 Programming the host interface
The Xon/Xoff logic generates interrupts only in response to recognizing either of the
characters in the XonCR or XoffCR (Xon or Xoff Character Registers). The transmitter
activity initiated by the Xon/Xoff logic or any CR command does not generate an interrupt.
The character comparators operate regardless of the value in MR3[3:2]. Hence the
comparators may be used as general-purpose character detectors by setting
MR3[3:2] = 00 and enabling the Xon/Xoff interrupt in the IMR.
The UART can present the Xon/Xoff recognition event to the interrupt arbiter for IRQN
generation. The IRQN generation may be masked by setting bit 4 of the Interrupt Mask
Register, IMR. The bid level of an Xon/Xoff recognition event is controlled by the Bidding
Control Register X, BCRx, of the channel. The interrupt status can be examined in ISR[4].
If cleared, no Xon/Xoff recognition event is interrupting. If set, an Xon or Xoff recognition
event has been detected. The X Interrupt Status Register (XISR) can be read for details of
the interrupt and to examine other, non-interrupting, status of the Xon/Xoff logic. Refer to
Section 8.3.4 “Xon/Xoff Interrupt Status Register
The character recognition function and the associated interrupt generation is disabled on
hardware or software reset.
This mode is used to address a particular UART among a group connected to the same
serial data source. Normally it is accomplished by redefining the meaning of the parity bit
such that it indicates a character as address or data. While this method is fully supported
in the SC28L201, it also supports recognition of the character itself. Upon recognition of
its address the receiver will be enabled and data loaded onto the RxFIFO.
Further, the Address recognition has the ability, if so programmed, to disable (not reset)
the receiver when an address is seen that is not recognized as its own. The particular
features of ‘Auto Wake and Auto Doze’ are described in the detailed descriptions under
Section 7.4.7 “Receiver
Remark: Care should be taken in the programming of the character recognition registers.
Programming 0x00, for example, may result in a break condition being recognized as a
control character. This will be further complicated when binary data is being processed.
The SC28L201 is designed for a very close compatibility with legacy software written for
other Philips/Signetics 2 channel UARTs. The part will initialize to the SC28L91 function.
This function is controlled in the lower 16 address positions.
A reset (both hardware and software) will return the part to this mode with the control
registers set for 9600 baud, 8 bits, no parity and one stop bit. Interrupt will be set for
Receiver Ready and transmitter Empty. Transmitters and receivers will not be enabled.
Basic operation should be obtained by a single write of 0xE0 to the Command Register.
That will enable the receiver and transmitter.
Addressing outside of the lower 16 address spaces will enable all the advanced features.
In general, before calling legacy code, advanced features should be disabled (character
stripping, for example).
Rev. 01 — 31 October 2005
operation”.
3.3 V, 5 V UART, 3.125 Mbit/s, with 256-byte FIFO
(XISR)”.
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
SC28L201
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