SC16C554IB80,551 NXP Semiconductors, SC16C554IB80,551 Datasheet - Page 32

• Manufacturer Part Number: SC16C554IB80,551
• Description: IC UART QUAD W/FIFO 80-LQFP
• Manufacturer: NXP Semiconductors

Specifications of SC16C554IB80,551

• Number Of Channels: 4, QUART
• Fifo's: 16 Byte
• Voltage - Supply: 2.5V, 3.3V, 5V
• With Auto Flow Control: Yes
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• With Cmos: Yes
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-3271; 935270075551; SC16C554IB80-S

Philips Semiconductors
9397 750 11616
Product data
7.10 Enhanced Feature Register (EFR)
7.9 Scratchpad Register (SPR)
Table 20:
[1]
The SC16C554/554D provides a temporary data register to store 8 bits of user
information.
Enhanced features are enabled or disabled using this register.
Bits 0 through 4 provide single or dual character software flow control selection.
When the Xon1 and Xon2 and/or Xoff1 and Xoff2 modes are selected, the double
8-bit words are concatenated into two sequential numbers.
Table 21:
Bit
1
0
Bit
7
6
Whenever any MSR bit 0-3 is set to logic 1, a Modem Status Interrupt will be generated.
Symbol
MSR[1]
MSR[0]
Symbol
EFR[7]
EFR[6]
Modem Status Register bits description
Enhanced Feature Register bits description
Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder
Rev. 04 — 19 June 2003
Description
Description
Auto CTS. Automatic CTS Flow Control.
Auto RTS. Automatic RTS may be used for hardware flow control by
enabling EFR[6]. When Auto RTS is selected, an interrupt will be
generated when the receive FIFO is filled to the programmed trigger
level and RTS will go to a logic 1 at the next trigger level. RTS will return
to a logic 0 when data is unloaded below the next lower trigger level
(Programmed trigger level -1). The state of this register bit changes with
the status of the hardware flow control. RTS functions normally when
hardware flow control is disabled.
DSR
CTS
Logic 0 = No DSR change (normal default condition).
Logic 1 = The DSR input to the SC16C554/554D has changed state
since the last time it was read. A modem Status Interrupt will be
generated.
Logic 0 = No CTS change (normal default condition).
Logic 1 = The CTS input to the SC16C554/554D has changed state
since the last time it was read. A modem Status Interrupt will be
generated.
Logic 0 = Automatic CTS flow control is disabled (normal default
condition).
Logic 1 = Enable Automatic CTS flow control. Transmission will stop
when CTS goes to a logical 1. Transmission will resume when the CTS
pin returns to a logical 0.
Logic 0 = Automatic RTS flow control is disabled (normal default
condition).
Logic 1 = Enable Automatic RTS flow control.
[1]
[1]
…continued
SC16C554/554D
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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