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SC16C652B Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. SC16C652B
Description  5V, 3.3 V and 2.5V dual UART, 5 Mbit/s (max.),with 32-byte FIFOs and infrared(IrDA) encoder/decoder
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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SC16C652B Datasheet(HTML) 6 Page - NXP Semiconductors

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Philips Semiconductors
SC16C652B
Dual UART with 32-byte FIFOs and IrDA encoder/decoder
Product data
Rev. 03 — 10 December 2004
6 of 44
9397 750 14452
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
TXRDYA,
TXRDYB
43, 6
-
O
Transmit Ready A, B (Active-LOW). These outputs provide the TX FIFO/THR
status for individual transmit channels (A-B). TXRDYn is primarily intended for
monitoring DMA mode 1 transfers for the transmit data FIFOs. An individual
channel’s TXRDYA, TXRDYB buffer ready status is indicated by logic 0, i.e., at
lease one location is empty and available in the FIFO or THR. This pin goes to a
logic 1 (DMA mode 1) when there are no more empty locations in the FIFO or
THR. This signal can also be used for single mode transfers (DMA mode 0).
VCC
42
26
I
Power supply input.
XTAL1
13
10
I
Crystal or external clock input. Functions as a crystal input or as an external
clock input. A crystal can be connected between this pin and XTAL2 to form an
internal oscillator circuit. This configuration requires an external 1 M
Ω resistor
between the XTAL1 and XTAL2 pins. Alternatively, an external clock can be
connected to this pin to provide custom data rates. (See Section 6.8
“Programmable baud rate generator”.) See Figure 4.
XTAL2
14
11
O
Output of the crystal oscillator or buffered clock. (See also XTAL1.) Crystal
oscillator output or buffered clock output. Should be left open if an external clock is
connected to XTAL1. For extended frequency operation, this pin should be tied to
VCC via a 2 kΩ resistor.
CDA,
CDB
40, 16
-
I
Carrier Detect (Active-LOW). These inputs are associated with individual UART
channels A through B. A logic 0 on this pin indicates that a carrier has been
detected by the modem for that channel.
CTSA,
CTSB
38, 23
25, 16
I
Clear to Send (Active-LOW). These inputs are associated with individual UART
channels, A through B. A logic 0 on the CTS pin indicates the modem or data set
is ready to accept transmit data from the SC16C652B. Status can be tested by
reading MSR[4]. This pin has no effect on the UART’s transmit or receive
operation.
DSRA,
DSRB
39, 20
-
I
Data Set Ready (Active-LOW). These inputs are associated with individual UART
channels, A through B. A logic 0 on this pin indicates the modem or data set is
powered-on and is ready for data exchange with the UART. This pin has no effect
on the UART’s transmit or receive operation.
DTRA,
DTRB
34, 35
-
O
Data Terminal Ready (Active-LOW). These outputs are associated with
individual UART channels, A through B. A logic 0 on this pin indicates that the
SC16C652B is powered-on and ready. This pin can be controlled via the modem
control register. Writing a logic 1 to MCR[0] will set the DTR output to logic 0,
enabling the modem. This pin will be a logic 1 after writing a logic 0 to MCR[0], or
after a reset. This pin has no effect on the UART’s transmit or receive operation.
RIA, RIB
41, 21
-
I
Ring Indicator (Active-LOW). These inputs are associated with individual UART
channels, A through B. A logic 0 on this pin indicates the modem has received a
ringing signal from the telephone line. A logic 1 transition on this input pin will
generate an interrupt.
Table 2:
Pin description…continued
Symbol
Pin
Type Description
LQFP48 HVQFN32


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