sc16c654 NXP Semiconductors, sc16c654 Datasheet - Page 24

• Manufacturer Part Number: sc16c654
• Description: Quad Uart With 64-byte Fifo And Infrared Irda Encoder/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 11617
Product data
Table 10:
Table 11:
Table 12:
Bit
2
1
0
FCR[7]
0
0
1
1
FCR[5]
0
0
1
1
Symbol
FCR[2]
FCR[1]
FCR[0]
FIFO Control Register bits description
RCVR trigger levels
TX trigger levels
Quad UART with 64-byte FIFO and infrared (IrDA) encoder/decoder
FCR[6]
0
1
0
1
FCR[4]
0
1
0
1
Rev. 04 — 19 June 2003
Description
Transmit operation in mode ‘1’: When the SC16C654/654D is in FIFO
mode (FCR[0] = logic 1; FCR[3] = logic 1), the TXRDY pin will be a
logic 1 when the transmit FIFO is completely full. It will be a logic 0 when
the trigger level has been reached.
Receive operation in mode ‘1’: When the SC16C654/654D is in FIFO
mode (FCR[0] = logic 1; FCR[3] = logic 1) and the trigger level has been
reached, or a Receive Time-Out has occurred, the RXRDY pin will go to
a logic 0. Once activated, it will go to a logic 1 after there are no more
characters in the FIFO.
XMIT FIFO reset.
RCVR FIFO reset.
FIFO enable.
Logic 0 = No FIFO transmit reset (normal default condition).
Logic 1 = Clears the contents of the transmit FIFO and resets the
FIFO counter logic (the transmit shift register is not cleared or
altered). This bit will return to a logic 0 after clearing the FIFO.
Logic 0 = No FIFO receive reset (normal default condition).
Logic 1 = Clears the contents of the receive FIFO and resets the FIFO
counter logic (the receive shift register is not cleared or altered). This
bit will return to a logic 0 after clearing the FIFO.
Logic 0 = Disable the transmit and receive FIFO (normal default
condition).
Logic 1 = Enable the transmit and receive FIFO. This bit must be a
‘1’ when other FCR bits are written to, or they will not be
programmed.
RX FIFO trigger level
08
16
56
60
TX FIFO trigger level (# of characters)
08
16
32
56
…continued
SC16C654/654D
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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