sc16c2552b NXP Semiconductors, sc16c2552b Datasheet - Page 16

• Manufacturer Part Number: sc16c2552b
• Description: Sc16c2552b 5 V, 3.3 V And 2.5 V Dual Uart, 5 Mbit/s Max. , With 16-byte Fifos
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 14442
Product data
Table 8:
Table 9:
Bit
3
(continued)
2
1
0
FCR[7]
0
0
1
1
FIFO Control Register bits description
RCVR trigger levels
Symbol
FCR[2]
FCR[1]
FCR[0]
FCR[6]
0
1
0
1
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs
Rev. 02 — 13 December 2004
Description
Transmit operation in mode ‘1’: When the SC16C2552B 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 if one or more FIFO locations are empty.
Receive operation in mode ‘1’: When the SC16C2552B 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 signal at the MF 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.
NOTE: The AFR register must be set to the RXRDY mode prior to
any possible reading of the RXRDY signal.
XMIT FIFO reset.
RCVR FIFO reset.
FIFOs enabled.
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
01
04
08
14
…continued
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
SC16C2552B
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