Data Sheet

SC16C650B
5 V, 3.3 V and 2.5 V UART with 32-byte FIFOs and infrared
(IrDA) encoder/decoder
Rev. 04 — 14 September 2009
Product data sheet
1. General description
The SC16C650B is a Universal Asynchronous Receiver and Transmitter (UART) used for
serial data communications. Its principal function is to convert parallel data into serial
data, and vice versa. The UART can handle serial data rates up to 3 Mbit/s.
The SC16C650B is pin compatible with the ST16C650A and it will power-up to be
functionally equivalent to the 16C450. Programming of control registers enables the
added features of the SC16C650B. Some of these added features are the 32-byte receive
and transmit FIFOs, automatic hardware or software flow control and infrared
encoding/decoding. The selectable auto-flow control feature significantly reduces software
overload and increases system efficiency while in FIFO mode by automatically controlling
serial data flow using RTS output and CTS input signals. The SC16C650B also provides
DMA mode data transfers through FIFO trigger levels and the RXRDY and TXRDY
signals. On-board status registers provide the user with error indications, operational
status, and modem interface control. System interrupts may be tailored to meet user
requirements. An internal loopback capability allows on-board diagnostics.
The SC16C650B operates at 5 V, 3.3 V and 2.5 V, and the industrial temperature range,
and is available in plastic PLCC44, LQFP48, and HVQFN32 packages.
2. Features
n
n
n
n
n
n
n
n
n
n
n
n
1.
Single channel
5 V, 3.3 V and 2.5 V operation
5 V tolerant on input only pins1
Industrial temperature range (−40 °C to +85 °C)
After reset, all registers are identical to the typical 16C450 register set
Capable of running with all existing generic 16C450 software
Pin compatibility with the industry-standard ST16C450/550, TL16C450/550,
PC16C450/550. Software compatible with ST16C650.
Up to 3 Mbit/s transmit/receive operation at 5 V, 2 Mbit/s at 3.3 V, and 1 Mbit/s at 2.5 V
32 byte transmit FIFO
32 byte receive FIFO with error flags
Programmable auto-RTS and auto-CTS
u In auto-CTS mode, CTS controls transmitter
u In auto-RTS mode, RX FIFO contents and threshold control RTS
Automatic software/hardware flow control
For data bus pins D7 to D0, see Table 26 “Limiting values”.
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Programmable Xon/Xoff characters
Software selectable baud rate generator
Supports IrDA version 1.0 (up to 115.2 kbit/s)
Four selectable Receive and Transmit FIFO interrupt trigger levels
Standard modem interface or infrared IrDA encoder/decoder interface
Sleep mode
Standard asynchronous error and framing bits (Start, Stop, and Parity Overrun Break)
Independent receiver clock input
Transmit, Receive, Line Status, and Data Set interrupts independently controlled
Fully programmable character formatting:
u 5, 6, 7, or 8-bit characters
u Even, odd, or no-parity formats
u 1, 11⁄2, or 2-stop bit
u Baud generation (DC to 3 Mbit/s)
False start-bit detection
Complete status reporting capabilities
3-state output TTL drive capabilities for bidirectional data bus and control bus
Line break generation and detection
Internal diagnostic capabilities:
u Loopback controls for communications link fault isolation
Prioritized interrupt system controls
Modem control functions (CTS, RTS, DSR, DTR, RI, DCD)
3. Ordering information
Table 1.
Ordering information
Industrial: VCC = 2.5 V, 3.3 V or 5 V ± 10 %; Tamb = −40 °C to +85 °C.
Type number
Package
Name
Description
Version
SC16C650BIA44
PLCC44
plastic leaded chip carrier; 44 leads
SOT187-2
SC16C650BIB48
LQFP48
plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm
SOT313-2
SC16C650BIBS
HVQFN32
plastic thermal enhanced very thin quad flat package; no leads;
32 terminals; body 5 × 5 × 0.85 mm
SOT617-1
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
2 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
4. Block diagram
SC16C650B
D0 to D7
IOR, IOR
IOW, IOW
RESET
TRANSMIT
FIFO
REGISTERS
DATA BUS
AND
CONTROL
LOGIC
A0 to A2
CS0, CS1, CS2
AS
REGISTER
SELECT
LOGIC
INTERCONNECT BUS LINES
AND
CONTROL SIGNALS
FLOW
CONTROL
LOGIC
TRANSMIT
SHIFT
REGISTER
TX
IR
ENCODER
RECEIVE
FIFO
REGISTERS
FLOW
CONTROL
LOGIC
RECEIVE
SHIFT
REGISTER
RX
IR
DECODER
DDIS
DTR
RTS
OUT1, OUT2
INT
TXRDY
RXRDY
INTERRUPT
CONTROL
LOGIC
CLOCK AND
BAUD RATE
GENERATOR
MODEM
CONTROL
LOGIC
CTS
RI
DCD
DSR
002aaa602
XTAL1
RCLK
Fig 1.
XTAL2
BAUDOUT
Block diagram
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
3 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
5. Pinning information
n.c.
1
40 CTS
D0
2
41 DSR
D1
3
42 DCD
D2
4
43 RI
D3
5
44 VCC
D4
6
5.1 Pinning
D5
7
39 RESET
D6
8
38 OUT1
D7
9
37 DTR
RCLK 10
36 RTS
RX 11
35 OUT2
SC16C650BIA44
n.c. 12
34 n.c.
TX 13
33 INT
AS 28
TXRDY 27
IOR 25
DDIS 26
IOR 24
n.c. 23
37 n.c.
38 CTS
39 DSR
40 DCD
41 RI
42 VCC
43 D0
44 D1
45 D2
46 D3
47 D4
n.c.
1
36 n.c.
D5
2
35 RESET
D6
3
34 OUT1
D7
4
33 DTR
RCLK
5
32 RTS
n.c.
6
RX
7
TX
8
29 RXRDY
CS0
9
28 A0
CS1 10
27 A1
CS2 11
26 A2
31 OUT2
SC16C650BIB48
30 INT
BAUDOUT 12
AS 24
TXRDY 23
DDIS 22
n.c. 21
IOR 20
002aaa604
Pin configuration for LQFP48
SC16C650B_4
Product data sheet
IOR 19
GND 18
IOW 17
IOW 16
XTAL2 15
XTAL1 14
25 n.c.
n.c. 13
Fig 3.
002aaa603
Pin configuration for PLCC44
48 n.c.
Fig 2.
GND 22
29 A2
IOW 21
30 A1
BAUDOUT 17
IOW 20
31 A0
CS2 16
XTAL2 19
32 RXRDY
CS1 15
XTAL1 18
CS0 14
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
4 of 48
SC16C650B
NXP Semiconductors
25 CTS
26 DSR
27 VCC
28 D0
29 D1
30 D2
32 D4
terminal 1
index area
31 D3
UART with 32-byte FIFOs and IrDA encoder/decoder
D5
1
24 RESET
D6
2
23 OUT
D7
3
22 DTR
RCLK
4
RX
5
TX
6
19 RXRDY
CS
7
18 A0
BAUDOUT
8
17 A1
21 RTS
20 INT
A2 16
TXRDY 15
IOR 14
GND 13
n.c. 12
IOW 11
9
XTAL1
XTAL2 10
SC16C650BIBS
002aaa947
Transparent top view
Fig 4.
Pin configuration for HVQFN32
5.2 Pin description
Table 2.
Symbol
Pin description
Pin
Type
Description
Register select. A0 to A2 are sued during read and write
operations to select the UART register to read from or write to.
Refer to Table 3 for register addresses and refer to signal AS
description.
PLCC44 LQFP48 HVQFN32
A0
31
28
18
I
A1
30
27
17
I
A2
29
26
16
I
AS
28
24
-
I
Address strobe. When AS is active (LOW), A0, A1 and A2 and
CS0 CS1 and CS2 drive the internal select logic directly. When AS
is HIGH, the register select and chip select signals are held at the
logic levels they were in when the LOW-to-HIGH transition of AS
occurred.
BAUDOUT
17
12
8
O
Baud out. BAUDOUT is a 16× clock signal for the transmitter
section of the UART. The clock rate is established by the reference
oscillator frequency divided by a divisor specified in the baud
generator divisor latches. BAUDOUT may also be used for the
receiver section by tying this output to RCLK.
CS0
14
9
-
I
CS1
15
10
-
I
CS2
16
11
-
I
Chip select. When CS0 and CS1 are HIGH and CS2 is LOW, these
3 inputs select the UART. When any of these inputs are inactive, the
UART remains inactive (refer to AS description).
CS
-
-
7
I
CTS
40
38
25
I
Clear to send. CTS is a modem status signal. Its condition can be
checked by reading bit 4 (CTS) of the Modem Status Register
(MSR). MSR[0] (∆CTS) indicates that CTS has changed states
since the last read from the MSR. If the modem status interrupt is
enabled when CTS changes levels and the auto-CTS mode is not
enabled, an interrupt is generated. CTS is also used in the
auto-CTS mode to control the transmitter.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
5 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 2.
Symbol
Pin description …continued
Pin
Type
Description
Data bus. Eight data lines with 3-state outputs provide a
bidirectional path for data, control and status information between
the UART and the CPU.
PLCC44 LQFP48 HVQFN32
D0
2
43
28
I/O
D1
3
44
29
I/O
D2
4
45
30
I/O
D3
5
46
31
I/O
D4
6
47
32
I/O
D5
7
2
1
I/O
D6
8
3
2
I/O
D7
9
4
3
I/O
DCD
42
40
-
I
Data carrier detect. DCD is a modem status signal. Its condition
can be checked by reading MSR[7] (DCD). MSR[3] (∆DCD)
indicates that DCD has changed states since the last read from the
MSR. If the modem status interrupt is enabled when DCD changes
levels, an interrupt is generated.
DDIS
26
22
-
O
Driver disable. DDIS is active (LOW) when the CPU is reading
data. When inactive (HIGH), DDIS can disable an external
transceiver.
DSR
41
39
26
I
Data set ready. DSR is a modem status signal. Its condition can be
checked by reading MSR[5] (DSR). MSR[1] (∆DSR) indicates DSR
has changed levels since the last read from the MSR. If the modem
status interrupt is enabled when DSR changes levels, an interrupt is
generated.
DTR
37
33
22
O
Data terminal ready. When active (LOW), DTR informs a modem
or data set that the UART is ready to establish communication. DTR
is placed in the active level by setting the DTR bit of the Modem
Control Register. DTR is placed in the inactive level either as a
result of a Master Reset, during loopback mode operation, or
clearing the DTR bit.
INT
33
30
20
O
Interrupt. When active (HIGH), INT informs the CPU that the UART
has an interrupt to be serviced. Four conditions that cause an
interrupt to be issued are: a receiver error, received data that is
available or timed out (FIFO mode only), an empty transmitter
holding register or an enabled modem status interrupt. INT is reset
(deactivated) either when the interrupt is serviced or as a result of a
Master Reset.
OUT1
38
34
-
O
OUT2
35
31
-
O
OUT
-
-
23
O
Outputs 1 and 2. These are user-designated output terminals that
are set to the active (low) level by setting respective Modem Control
Register (MCR) bits (OUT1 and OUT2). OUT1 and OUT2 are set to
the inactive (HIGH) level as a result of Master Reset, during
loopback mode operations, or by clearing bit 2 (OUT1) or bit 3
(OUT2) of the MCR.
RCLK
10
5
4
I
Receiver clock. RCLK is the 16× baud rate clock for the receiver
section of the UART.
Read inputs. When either IOR or IOR is active (LOW or HIGH,
respectively) while the UART is selected, the CPU is allowed to
read status information or data from a selected UART register. Only
one of these inputs is required for the transfer of data during a read
operation; the other input should be tied to its inactive level (i.e.,
IOR tied LOW or IOR tied HIGH).
IOR
25
20
-
I
IOR
24
19
14
I
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
6 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 2.
Symbol
Pin description …continued
Pin
Type
Description
PLCC44 LQFP48 HVQFN32
RESET
39
35
24
I
Master Reset. When active (HIGH), MR clears most UART
registers and sets the levels of various output signals.
RI
43
41
-
I
Ring indicator. RI is a modem status signal. Its condition can be
checked by reading MSR[6] (RI). MSR[2] (∆RI) indicates that RI has
changed from a LOW to a HIGH level since the last read from the
MSR. If the modem status interrupt is enabled when this transition
occurs, an interrupt is generated.
RTS
36
32
21
O
Request to send. When active, RTS informs the modem or data
set that the UART is ready to receive data. RTS is set to the active
level by setting the RTS modem control register bit and is set to the
inactive (HIGH) level either as a result of a Master Reset or during
loopback mode operations or by clearing bit 1 (RTS) of the MCR. In
the auto-RTS mode, RTS is set to the inactive level by the receiver
threshold control logic.
RXRDY
32
29
19
O
Receiver ready. Receiver direct memory access (DMA) signaling is
available with RXRDY. When operating in the FIFO mode, one of
two types of DMA signaling can be selected using the FIFO Control
Register bit 3 (FCR[3]). When operating in the 16C450 mode, only
DMA mode 0 is allowed. Mode 0 supports single-transfer DMA in
which a transfer is made between CPU bus cycles. Mode 1
supports multi-transfer DMA in which multiple transfers are made
continuously until the receiver FIFO has been emptied. In DMA
mode 0 (FCR[0] = 0 or FCR[0] = 1, FCR[3] = 0), when there is at
least one character in the receiver FIFO or Receive Holding
Register, RXRDY is active (LOW). When RXRDY has been active
but there are no characters in the FIFO or holding register, RXRDY
goes inactive (HIGH). In DMA mode 1 (FCR[0] = 1, FCR[3] = 1),
when the trigger level or the time-out has been reached, RXRDY
goes active (LOW); when it has been active but there are no more
characters in the FIFO or holding register, it goes inactive (HIGH).
RX
11
7
5
I
Serial data input. RX is serial data input from a connected
communications device.
TX
13
8
6
O
Serial data output. TX is composite serial data output to a
connected communication device. TX is set to the marking (HIGH)
level as a result of Master Reset.
TXRDY
27
23
15
O
Transmitter ready. Transmitter DMA signaling is available with
TXRDY. When operating in the FIFO mode, one of two types of
DMA signaling can be selected using FCR[3]. When operating in
the 16C450 mode, only DMA mode 0 is allowed. Mode 0 supports
single-transfer DMA in which a transfer is made between CPU bus
cycles. Mode 1 supports multi-transfer DMA in which multiple
transfers are made continuously until the transmit FIFO has been
filled.
VCC
44
42
27
power
2.5 V, 3 V or 5 V supply voltage.
power
Ground voltage.
Write inputs. When either IOW or IOW is active (LOW or HIGH,
respectively) and while the UART is selected, the CPU is allowed to
write control words or data into a selected UART register. Only one
of these inputs is required to transfer data during a write operation;
the other input should be tied to its inactive level (i.e., IOW tied LOW
or IOW tied HIGH).
GND
22
18
13[1]
IOW
21
17
-
I
IOW
20
16
11
I
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
7 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 2.
Symbol
Pin description …continued
Pin
Type
Description
PLCC44 LQFP48 HVQFN32
XTAL1
18
14
9
I
Crystal connection or external clock input.
XTAL2[2]
19
15
10
O
Crystal connection or the inversion of XTAL1 if XTAL1 is
driven.
n.c.
1, 12, 23, 1, 6, 13,
34
21, 25,
36, 37,
48
12
-
not connected
[1]
HVQFN32 package die supply ground is connected to both GND pin and exposed center pad. GND pin must be connected to supply
ground for proper device operation. For enhanced thermal, electrical, and board level performance, the exposed pad needs to be
soldered to the board using a corresponding thermal pad on the board and for proper heat conduction through the board, thermal vias
need to be incorporated in the PCB in the thermal pad region.
[2]
In Sleep mode, XTAL2 is left floating.
6. Functional description
The SC16C650B provides serial asynchronous receive data synchronization,
parallel-to-serial and serial-to-parallel data conversions for both the transmitter and
receiver sections. These functions are necessary for converting the serial data stream into
parallel data that is required with digital data systems. Synchronization for the serial data
stream is accomplished by adding start and stop bits to the transmit data to form a data
character (character orientated protocol). Data integrity is insured by attaching a parity bit
to the data character. The parity bit is checked by the receiver for any transmission bit
errors. The SC16C650B is fabricated with an advanced CMOS process to achieve low
drain power and high speed requirements.
The SC16C650B is an upward solution that provides 32 bytes of transmit and receive
FIFO memory, instead of none in the 16C450, or 16 bytes in the 16C550. The
SC16C650B is designed to work with high speed modems and shared network
environments that require fast data processing time. Increased performance is realized in
the SC16C650B by the larger transmit and receive FIFOs. This allows the external
processor to handle more networking tasks within a given time. In addition, the four
selectable levels of FIFO trigger interrupt and automatic hardware/software flow control is
uniquely provided for maximum data throughput performance, especially when operating
in a multi-channel environment. The combination of the above greatly reduces the
bandwidth requirement of the external controlling CPU, increases performance, and
reduces power consumption.
The SC16C650B is capable of operation up to 3 Mbit/s with a 48 MHz external clock input
(at 5 V).
The rich feature set of the SC16C650B is available through internal registers. Automatic
hardware/software flow control, selectable transmit and receive FIFO trigger level,
selectable TX and RX baud rates, modem interface controls, and a Sleep mode are some
of these features.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
8 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
6.1 Internal registers
The SC16C650B provides 17 internal registers for monitoring and control. These registers
are shown in Table 3. Twelve registers are similar to those already available in the
standard 16C550. These registers function as data holding registers (THR/RHR), interrupt
status and control registers (IER/ISR), a FIFO control register (FCR), line status and
control registers (LCR/LSR), modem status and control registers (MCR/MSR),
programmable data rate (clock) control registers (DLL/DLM), and a user accessible
ScratchPad Register (SPR). Beyond the general 16C550 features and capabilities, the
SC16C650B offers an enhanced feature register set (EFR, Xon1/Xoff1, Xon2/Xoff2) that
provides on-board hardware/software flow control. Register functions are more fully
described in the following paragraphs.
Table 3.
A2
Internal registers decoding
A1
A0
Read mode
Write mode
General register set (THR/RHR, IER/ISR, MCR/MSR, FCR, LCR/LSR, SPR)[1]
0
0
0
Receive Holding Register
Transmit Holding Register
0
0
1
Interrupt Enable Register
Interrupt Enable Register
0
1
0
Interrupt Status Register
FIFO Control Register
0
1
1
Line Control Register
Line Control Register
1
0
0
Modem Control Register
Modem Control Register
1
0
1
Line Status Register
n/a
1
1
0
Modem Status Register
n/a
1
1
1
Scratchpad Register
Scratchpad Register
Baud rate register set (DLL/DLM)[2]
0
0
0
LSB of Divisor Latch
0
0
1
MSB of Divisor Latch
Enhanced register set (EFR, Xon1, Xoff1, Xon2,
LSB of Divisor Latch
MSB of Divisor Latch
Xoff2)[3]
0
1
0
Enhanced Feature Register
Enhanced Feature Register
1
0
0
Xon1 word
Xon1 word
1
0
1
Xon2 word
Xon2 word
1
1
0
Xoff1 word
Xoff1 word
1
1
1
Xoff2 word
Xoff2 word
[1]
These registers are accessible only when LCR[7] is a logic 0.
[2]
These registers are accessible only when LCR[7] is a logic 1.
[3]
Enhanced Feature Register, Xon1, Xon2 and Xoff1, Xoff2 are accessible only when the LCR is set to BFh.
6.2 FIFO operation
The 32-byte transmit and receive data FIFOs are enabled by the FIFO Control Register
bit 0 (FCR[0]). With 16C550 devices, the user can set the receive trigger level, but not the
transmit trigger level. The SC16C650B provides independent trigger levels for both
receiver and transmitter. To remain compatible with SC16C550, the transmit interrupt
trigger level is set to 16 following a reset. It should be noted that the user can set the
transmit trigger levels by writing to the FCR register, but activation will not take place until
EFR[4] is set to a logic 1. The receiver FIFO section includes a time-out function to ensure
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
9 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
data is delivered to the external CPU. An interrupt is generated whenever the Receive
Holding Register (RHR) has not been read following the loading of a character or the
receive trigger level has not been reached.
Table 4.
Flow control mechanism
Selected trigger level
(characters)
INT pin activation
Negate RTS or
send Xoff
Assert RTS or
send Xon
8
8
8
0
16
16
16
7
24
24
24
15
28
28
28
23
6.3 Hardware flow control
When automatic hardware flow control is enabled, the SC16C650B monitors the CTS pin
for a remote buffer overflow indication and controls the RTS pin for local buffer overflows.
Automatic hardware flow control is selected by setting EFR[6] (RTS) and EFR[7] (CTS) to
a logic 1. If CTS changes from a logic 0 to a logic 1 indicating a flow control request,
ISR[5] will be set to a logic 1 (if enabled via IER[6,7]), and the SC16C650B will suspend
TX transmissions as soon as the stop bit of the character in process is shifted out.
Transmission is resumed after the CTS input returns to a logic 0, indicating more data may
be sent.
With the auto-RTS function enabled, an interrupt is generated when the receive FIFO
reaches the programmed trigger level. The RTS pin will not be forced to a logic 1 (RTS
off), until the receive FIFO reaches the next trigger level. However, the RTS pin will return
to a logic 0 after the data buffer (FIFO) is unloaded to the next trigger level below the
programmed trigger level. However, under the above described conditions, the
SC16C650B will continue to accept data until the receive FIFO is full.
6.4 Software flow control
When software flow control is enabled, the SC16C650B compares one or two sequential
receive data characters with the programmed Xon or Xoff character value(s). If received
character(s) match the programmed Xoff values, the SC16C650B will halt transmission
(TX) as soon as the current character(s) has completed transmission. When a match
occurs, the receive ready (if enabled via Xoff IER[5]) flags will be set and the interrupt
output pin (if receive interrupt is enabled) will be activated. Following a suspension due to
a match of the Xoff characters’ values, the SC16C650B will monitor the receive data
stream for a match to the Xon1, Xon2 character value(s). If a match is found, the
SC16C650B will resume operation and clear the flags (ISR[4]).
Reset initially sets the contents of the Xon/Xoff 8-bit flow control registers to a logic 0.
Following reset, the user can write any Xon/Xoff value desired for software flow control.
Different conditions can be set to detect Xon/Xoff characters and suspend/resume
transmissions. When double 8-bit Xon/Xoff characters are selected, the SC16C650B
compares two consecutive receive characters with two software flow control 8-bit values
(Xon1, Xon2, Xoff1, Xoff2) and controls TX transmissions accordingly. Under the above
described flow control mechanisms, flow control characters are not placed (stacked) in the
user accessible RX data buffer or FIFO. When using a software flow control the Xon/Xoff
characters cannot be used for data transfer.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
10 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
In the event that the receive buffer is overfilling and flow control needs to be executed, the
SC16C650B automatically sends an Xoff message (when enabled) via the serial TX
output to the remote modem. The SC16C650B sends the Xoff1/Xoff2 characters as soon
as received data passes the programmed trigger level. To clear this condition, the
SC16C650B will transmit the programmed Xon1/Xon2 characters as soon as receive data
drops below the next low or programmed trigger level.
6.5 Special feature software flow control
A special feature is provided to detect an 8-bit character when EFR[5] is set. When 8-bit
character is detected, it will be placed on the user-accessible data stack along with normal
incoming RX data. This condition is selected in conjunction with EFR[3:0]. Note that
software flow control should be turned off when using this special mode by setting
EFR[3:0] to a logic 0.
The SC16C650B compares each incoming receive character with Xoff2 data. If a match
exists, the received data will be transferred to the FIFO, and ISR[4] will be set to indicate
detection of a special character. Although Table 8 “SC16C650B internal registers” shows
each X-register with eight bits of character information, the actual number of bits is
dependent on the programmed word length. Line Control Register bits LCR[1:0] define the
number of character bits, i.e., either 5 bits, 6 bits, 7 bits or 8 bits. The word length selected
by LCR[1:0] also determine the number of bits that will be used for the special character
comparison. Bit 0 in the X-registers corresponds with the LSB bit for the receive character.
6.6 Hardware/software and time-out interrupts
Three special interrupts have been added to monitor the hardware and software flow
control. The interrupts are enabled by IER[7:5]. Care must be taken when handling these
interrupts. Following a reset, the transmitter interrupt is enabled, the SC16C650B will
issue an interrupt to indicate that the Transmit Holding Register is empty. This interrupt
must be serviced prior to continuing operations. The ISR register provides the current
singular highest priority interrupt only. It could be noted that CTS and RTS interrupts have
lowest interrupt priority. A condition can exist where a higher priority interrupt may mask
the lower priority CTS/RTS interrupt(s). Only after servicing the higher pending interrupt
will the lower priority CTS/RTS interrupt(s) be reflected in the status register. Servicing the
interrupt without investigating further interrupt conditions can result in data errors.
When two interrupt conditions have the same priority, it is important to service these
interrupts correctly. Receive Data Ready and Receive Time-Out have the same interrupt
priority (when enabled by IER[0]). The receiver issues an interrupt after the number of
characters have reached the programmed trigger level. In this case, the SC16C650B
FIFO may hold more characters than the programmed trigger level. Following the removal
of a data byte, the user should re-check LSR[0] for additional characters. A Receive
Time-Out will not occur if the receive FIFO is empty. The time-out counter is reset at the
center of each stop bit received or each time the Receive Holding Register (RHR) is read.
The actual time-out value is 4 character time.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
11 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
6.7 Programmable baud rate generator
The SC16C650B supports high speed modem technologies that have increased input
data rates by employing data compression schemes. For example, a 33.6 kbit/s modem
that employs data compression may require a 115.2 kbit/s input data rate. A 128.0 kbit/s
ISDN modem that supports data compression may need an input data rate of 460.8 kbit/s.
A single baud rate generator is provided for the transmitter and receiver, allowing
independent TX/RX channel control. The programmable baud rate generator is capable of
accepting an input clock up to 48 MHz, as required for supporting a 3 Mbit/s data rate.
The SC16C650B can be configured for internal or external clock operation. For internal
clock oscillator operation, an industry standard microprocessor crystal (parallel resonant,
22 pF to 33 pF load) is connected externally between the XTAL1 and XTAL2 pins (see
Figure 5). Alternatively, an external clock can be connected to the XTAL1 pin to clock the
internal baud rate generator for standard or custom rates (see Table 5).
XTAL1
XTAL2
X1
1.8432 MHz
C1
22 pF
XTAL1
XTAL2
X1
1.8432 MHz
C2
33 pF
C1
22 pF
1.5 kΩ
C2
47 pF
002aaa870
Fig 5.
Crystal oscillator connection
The generator divides the input 16× clock by any divisor from 1 to (216 − 1). The
SC16C650B divides the basic crystal or external clock by 16. The frequency of the
BAUDOUT output pin is exactly 16× (16 times) the selected baud rate
(BAUDOUT = 16 × baud rate). Customized baud rates can be achieved by selecting the
proper divisor values for the MSB and LSB sections of baud rate generator.
Setting MCR[7] to a logic 1 provides an additional divide-by-4, whereas setting MCR[7] to
a logic 0 only divides by 1 (see Table 5 and Figure 6).
Programming the baud rate generator registers DLM (MSB) and DLL (LSB) provides a
user capability for selecting the desired final baud rate. The example in Table 5 shows
selectable baud rates when using a 1.8432 MHz crystal and setting MCR[7] to a logic 0.
For custom baud rates, the divisor value can be calculated using Equation 1:
XTAL1 clock frequency
divisor ( in decimal ) = ---------------------------------------------------------------serial data rate × 16
SC16C650B_4
Product data sheet
(1)
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
12 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 5.
Baud rates using 1.8432 MHz or 3.072 MHz crystal
Using 1.8432 MHz crystal
Desired
baud rate
Divisor for
16× clock
50
Using 3.072 MHz crystal
Baud rate
error
Desired
baud rate
Divisor for
16× clock
2304
50
3840
75
1536
75
2560
110
1047
0.026
110
1745
0.026
134.5
857
0.058
134.5
1428
0.034
150
768
150
1280
300
384
300
640
600
192
600
320
1200
96
1200
160
1800
64
1800
107
2000
58
2000
96
2400
48
2400
80
3600
32
3600
53
4800
24
4800
40
7200
16
7200
27
9600
12
9600
20
19200
6
19200
10
38400
3
38400
5
56000
2
0.69
XTAL2
0.312
0.628
1.23
2.86
DIVIDE-BY-1
LOGIC
XTAL1
Baud rate
error
MCR[7] = 0
CLOCK
OSCILLATOR
LOGIC
BAUD RATE
GENERATOR
LOGIC
DIVIDE-BY-4
LOGIC
BAUDOUT
MCR[7] = 1
002aaa208
Fig 6.
Baud rate generator circuitry
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
13 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
6.8 DMA operation
The SC16C650B FIFO trigger level provides additional flexibility to the user for block
mode operation. The user can optionally operate the transmit and receive FIFOs in the
DMA mode (FCR[3]). The DMA mode affects the state of the RXRDY and TXRDY output
pins. Table 6 and Table 7 show this.
Remark: DMA operation is not supported in the HVQFN32 package.
Table 6.
Effect of DMA mode on state of RXRDY pin
Non-DMA mode
DMA mode
1 = FIFO empty
0-to-1 transition when FIFO empties
0 = at least 1 byte in FIFO
1-to-0 transition when FIFO reaches trigger level, or time-out occurs
Table 7.
Effect of DMA mode on state of TXRDY pin
Non-DMA mode
DMA mode
1 = at least 1 byte in FIFO
0-to-1 transition when FIFO becomes full
0 = FIFO empty
1-to-0 transition when FIFO has 1 empty space
6.9 Sleep mode
The SC16C650B is designed to operate with low power consumption. A special Sleep
mode is included to further reduce power consumption when the chip is not being used.
With EFR[4] and IER[4] enabled (set to a logic 1), the SC16C650B enters the Sleep
mode, but resumes normal operation when a start bit is detected, a change of state on
any of the modem input pins RI, CTS, DSR, DCD, RX pin, or a transmit data is provided
by the user. If the Sleep mode is enabled and the SC16C650B is awakened by one of the
conditions described above, it will return to the Sleep mode automatically after the last
character is transmitted or read by the user. In any case, the Sleep mode will not be
entered while an interrupt(s) is pending. The SC16C650B will stay in the Sleep mode of
operation until it is disabled by setting IER[4] to a logic 0.
6.10 Loopback mode
The internal loopback capability allows on-board diagnostics. In the loopback mode, the
normal modem interface pins are disconnected and reconfigured for loopback internally.
MCR[3:0] register bits are used for controlling loopback diagnostic testing. In the loopback
mode, OUT1 (bit 2) and OUT2 (bit 3) in the MCR register control the modem RI and DCD
inputs, respectively. MCR signals DTR (bit 0) and RTS (bit 1) are used to control the
modem DSR and CTS inputs, respectively. The transmitter output (TX) and the receiver
input (RX) are disconnected from their associated interface pins, and instead are
connected together internally (see Figure 7). The CTS, DSR, DCD, and RI are
disconnected from their normal modem control input pins, and instead are connected
internally to DTR, RTS, OUT1 and OUT2. Loopback test data is entered into the Transmit
Holding Register via the user data bus interface, D0 to D7. The transmit UART serializes
the data and passes the serial data to the receive UART via the internal loopback
connection. The receive UART converts the serial data back into parallel data that is then
made available at the user data interface D0 to D7. The user optionally compares the
received data to the initial transmitted data for verifying error-free operation of the UART
TX/RX circuits.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
14 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
In this mode, the receiver and transmitter interrupts are fully operational. The Modem
Control Interrupts are also operational. However, the interrupts can only be read using
lower four bits of the Modem Status Register (MSR[3:0]) instead of the four Modem Status
Register bits 7:4. The interrupts are still controlled by the IER.
SC16C650B
D0 to D7
IOR, IOR
IOW, IOW
RESET
TRANSMIT
FIFO
REGISTERS
TX
DATA BUS
AND
CONTROL
LOGIC
REGISTER
SELECT
LOGIC
INTERCONNECT BUS LINES
AND
CONTROL SIGNALS
FLOW
CONTROL
LOGIC
A0 to A2
CS0, CS1, CS2
AS
TRANSMIT
SHIFT
REGISTER
RECEIVE
FIFO
REGISTERS
FLOW
CONTROL
LOGIC
IR
ENCODER
MCR[4] = 1
RECEIVE
SHIFT
REGISTER
RX
IR
DECODER
RTS
DDIS
CTS
DTR
MODEM
CONTROL
LOGIC
INT
TXRDY
RXRDY
INTERRUPT
CONTROL
LOGIC
DSR
OUT1
CLOCK AND
BAUD RATE
GENERATOR
RI
OUT2
DCD
002aaa606
XTAL1
RCLK
Fig 7.
XTAL2
BAUDOUT
Internal loopback mode diagram
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
15 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
7. Register descriptions
Table 8 details the assigned bit functions for the seventeen SC16C650B internal registers.
The assigned bit functions are more fully defined in Section 7.1 through Section 7.11.
Table 8.
A2
A1
SC16C650B internal registers
A0
Register Default Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
[1]
General register set[2]
0
0
0
RHR
XX
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
0
0
0
THR
XX
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
0
0
1
IER
00
CTS
interrupt
RTS
interrupt
Xoff
interrupt
Sleep
mode[3]
[3]
[3]
[3]
modem
status
interrupt
receive
transmit receive
line status holding holding
interrupt
register register
0
1
0
FCR
00
RCVR
trigger
(MSB)
RCVR
trigger
(LSB)
TX
trigger
(MSB)[3]
TX
trigger
(LSB)[3]
DMA mode XMIT
select[4]
FIFO
reset
RCVR
FIFO
reset
FIFO
enable
0
1
0
ISR
01
FIFOs
enabled
FIFOs
enabled
INT
priority
bit 4
INT
priority
bit 3
INT priority INT
bit 2
priority
bit 1
INT
priority
bit 0
INT
status
0
1
1
LCR
00
divisor
latch
enable
set
break
set parity even
parity
parity
enable
stop bits
word
length
bit 1
word
length
bit 0
1
0
0
MCR
00
Clock
select[3]
IR
INT type
enable[3] select[3]
loopback
OUT2[5]
OUT1,
OUT[6]
RTS
DTR
1
0
1
LSR
60
FIFO
data
error
trans.
empty
trans.
holding
empty
break
interrupt
framing
error
parity
error
overrun
error
receive
data
ready
1
1
0
MSR
X0
DCD
RI
DSR
CTS
∆DCD
∆RI
∆DSR
∆CTS
1
1
1
SPR
FF
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
XX
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
XX
bit 15
bit 14
bit 13
bit 12
bit 11
bit 10
bit 9
bit 8
Special register set[7]
0
0
0
DLL
0
0
1
DLM
Enhanced register
set[8]
0
1
0
EFR
00
Auto
CTS
Auto
RTS
Special
char.
select
Cont-3
Enable
IER[4:7], Tx, Rx
ISR[4,5], control
FCR[4,5],
MCR[5:7]
Cont-2
Tx, Rx
control
Cont-1
Tx, Rx
control
Cont-0
Tx, Rx
control
1
0
0
Xon1
00
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
1
0
1
Xon2
00
bit 15
bit 14
bit 13
bit 12
bit 11
bit 10
bit 9
bit 8
1
1
0
Xoff1
00
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
1
1
1
Xoff2
00
bit 15
bit 14
bit 13
bit 12
bit 11
bit 10
bit 9
bit 8
[1]
The value shown represents the register’s initialized HEX value; X = n/a.
[2]
These registers are accessible only when LCR[7] = 0.
[3]
These bits are only accessible when EFR[4] is set.
[4]
This function is not supported in the HVQFN32 package, and should not be written.
[5]
OUT2 pin is not supported in the HVQFN32 package, and this bit should not be written.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
16 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
[6]
This bit controls the OUT pin in the HVQFN32 package, and OUT1 in the other packages.
[7]
The Special register set is accessible only when LCR[7] is set to a logic 1.
[8]
Enhanced Feature Register (EFR), Xon1, Xon2 Xoff1, Xoff2 are accessible only when LCR is set to BFh.
7.1 Transmit Holding Register (THR) and Receive Holding Register (RHR)
The serial transmitter section consists of an 8-bit Transmit Holding Register (THR) and
Transmit Shift Register (TSR). The status of the THR is provided in the Line Status
Register (LSR). Writing to the THR transfers the contents of the data bus (D[7:0]) to the
THR, providing that the THR or TSR is empty. The THR empty flag in the LSR register will
be set to a logic 1 when the transmitter is empty or when data is transferred to the TSR.
Note that a write operation can be performed when the THR empty flag is set
(logic 0 = FIFO full; logic 1 = at least one FIFO location available).
The serial receive section also contains an 8-bit Receive Holding Register (RHR).
Receive data is removed from the SC16C650B and receive FIFO by reading the RHR
register. The receive section provides a mechanism to prevent false starts. On the falling
edge of a start or false start bit, an internal receiver counter starts counting clocks at the
16× clock rate. After 71⁄2 clocks, the start bit time should be shifted to the center of the
start bit. At this time the start bit is sampled, and if it is still a logic 0 it is validated.
Evaluating the start bit in this manner prevents the receiver from assembling a false
character. Receiver status codes will be posted in the LSR.
7.2 Interrupt Enable Register (IER)
The Interrupt Enable Register (IER) masks the interrupts from receiver ready, transmitter
empty, line status and modem status registers. These interrupts would normally be seen
on the INT output pin.
Table 9.
Interrupt Enable Register bits description
Bit
Symbol
Description
7
IER[7]
CTS interrupt.
logic 0 = disable the CTS interrupt (normal default condition)
logic 1 = enable the CTS interrupt. The SC16C650B issues an interrupt when
the CTS pin transitions from a logic 0 to a logic 1.
6
IER[6]
RTS interrupt.
logic 0 = disable the RTS interrupt (normal default condition)
logic 1 = enable the RTS interrupt. The SC16C650B issues an interrupt when
the RTS pin transitions from a logic 0 to a logic 1.
5
IER[5]
Xoff interrupt.
logic 0 = disable the software flow control, receive Xoff interrupt (normal
default condition).
logic 1 = enable the software flow control, receive Xoff interrupt. See Section
6.4 “Software flow control” for details.
4
IER[4]
Sleep mode.
logic 0 = disable Sleep mode (normal default condition)
logic 1 = enable Sleep mode. See Section 6.9 “Sleep mode” for details.
3
IER[3]
Modem Status Interrupt.
logic 0 = disable the modem status register interrupt (normal default
condition)
logic 1 = enable the modem status register interrupt
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
17 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 9.
Interrupt Enable Register bits description …continued
Bit
Symbol
Description
2
IER[2]
Receive Line Status interrupt. This interrupt will be issued whenever a fully
assembled receive character is transferred from RSR to the RHR/FIFO, i.e.,
data ready, LSR[0].
logic 0 = disable the receiver line status interrupt (normal default condition)
logic 1 = enable the receiver line status interrupt
1
IER[1]
Transmit Holding Register interrupt. This interrupt will be issued whenever the
THR is empty, and is associated with LSR[1].
logic 0 = disable the transmitter empty interrupt (normal default condition)
logic 1 = enable the transmitter empty interrupt
0
IER[0]
Receive Holding Register interrupt. This interrupt will be issued when the FIFO
has reached the programmed trigger level, or is cleared when the FIFO drops
below the trigger level in the FIFO mode of operation.
logic 0 = disable the receiver ready interrupt (normal default condition)
logic 1 = enable the receiver ready interrupt
7.2.1 IER versus receive FIFO interrupt mode operation
When the receive FIFO (FCR[0] = logic 1), and receive interrupts (IER[0] = logic 1) are
enabled, the receive interrupts and register status will reflect the following:
• The receive data available interrupts are issued to the external CPU when the FIFO
has reached the programmed trigger level. It will be cleared when the FIFO drops
below the programmed trigger level.
• FIFO status will also be reflected in the user accessible ISR register when the FIFO
trigger level is reached. Both the ISR register status bit and the interrupt will be
cleared when the FIFO drops below the trigger level.
• The data ready bit (LSR[0]) is set as soon as a character is transferred from the shift
register to the receive FIFO. It is reset when the FIFO is empty.
7.2.2 IER versus receive/transmit FIFO polled mode operation
When FCR[0] = logic 1, resetting IER[3:0] enables the SC16C650B in the FIFO polled
mode of operation. Since the receiver and transmitter have separate bits in the LSR,
either or both can be used in the polled mode by selecting respective transmit or receive
control bit(s).
•
•
•
•
•
LSR[0] will be a logic 1 as long as there is one byte in the receive FIFO.
LSR[4:1] will provide the type of errors encountered, if any.
LSR[5] will indicate when the transmit FIFO is empty.
LSR[6] will indicate when both the transmit FIFO and transmit shift register are empty.
LSR[7] will indicate any FIFO data errors.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
18 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
7.3 FIFO Control Register (FCR)
This register is used to enable the FIFOs, clear the FIFOs, set the receive FIFO trigger
levels, and select the DMA mode.
7.3.1 DMA mode
7.3.1.1
Mode 0 (FCR bit 3 = 0)
Set and enable the interrupt for each single transmit or receive operation, and is similar to
the 16C450 mode. Transmit Ready (TXRDY) will go to a logic 0 whenever an empty
transmit space is available in the Transmit Holding Register (THR). Receive Ready
(RXRDY) will go to a logic 0 whenever the Receive Holding Register (RHR) is loaded with
a character.
7.3.1.2
Mode 1 (FCR bit 3 = 1)
Set and enable the interrupt in a block mode operation. The transmit interrupt is set when
the transmit FIFO is below the programmed trigger level. The receive interrupt is set when
the receive FIFO fills to the programmed trigger level. However, the FIFO continues to fill
regardless of the programmed level until the FIFO is full. RXRDY remains a logic 0 as long
as the FIFO fill level is above the programmed trigger level.
7.3.2 FIFO mode
Table 10.
FIFO Control Register bits description
Bit
Symbol
Description
7:6
FCR[7] (MSB),
FCR[6] (LSB)
RCVR trigger. These bits are used to set the trigger level for the receive
FIFO interrupt.
An interrupt is generated when the number of characters in the FIFO
equals the programmed trigger level. However, the FIFO will continue to
be loaded until it is full. Refer to Table 11.
5:4
3
FCR[5] (MSB),
FCR[4] (LSB)
Logic 0 or cleared is the default condition; TX trigger level = 16.
FCR[3]
DMA mode select.
These bits are used to set the trigger level for the transmit FIFO
interrupt. The SC16C650B will issue a transmit empty interrupt when
the number of characters in FIFO drops below the selected trigger level.
Refer to Table 12.
logic 0 = set DMA mode ‘0’ (normal default condition)
logic 1 = set DMA mode ‘1’
Transmit operation in mode ‘0’: When the SC16C650B is in the
16C450 mode (FIFOs disabled; FCR[0] = logic 0) or in the FIFO mode
(FIFOs enabled; FCR[0] = logic 1; FCR[3] = logic 0), and when there
are no characters in the transmit FIFO or transmit holding register, the
TXRDY pin will be a logic 0. Once active, the TXRDY pin will go to a
logic 1 after the first character is loaded into the transmit holding
register.
Receive operation in mode ‘0’: When the SC16C650B is in 16C450
mode, or in the FIFO mode (FCR[0] = logic 1; FCR[3] = logic 0) and
there is at least one character in the receive FIFO, the RXRDY pin will
be a logic 0. Once active, the RXRDY pin will go to a logic 1 when there
are no more characters in the receiver.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
19 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 10.
Bit
FIFO Control Register bits description …continued
Symbol
Description
3
(cont.)
Transmit operation in mode ‘1’: When the SC16C650B 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 FIFO has 1 empty space.
Receive operation in mode ‘1’: When the SC16C650B 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.
2
FCR[2]
XMIT FIFO reset.
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.
1
FCR[1]
RCVR FIFO reset.
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.
0
FCR[0]
FIFO enable.
logic 0 = disable the transmit and receive FIFO (normal default
condition)
logic 1 = enable the transmit and receive FIFO. This bit must be a
logic 1 when other FCR bits are written to, or they will not be
programmed.
Table 11.
RCVR trigger levels
FCR[7]
FCR[6]
RX FIFO trigger level (bytes)
0
0
8
0
1
16
1
0
24
1
1
28
Table 12.
TX FIFO trigger levels
FCR[5]
FCR[4]
TX FIFO trigger level (bytes)
0
0
16
0
1
8
1
0
24
1
1
30
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
20 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
7.4 Interrupt Status Register (ISR)
The SC16C650B provides six levels of prioritized interrupts to minimize external software
interaction. The Interrupt Status Register (ISR) provides the user with six interrupt status
bits. Performing a read cycle on the ISR will provide the user with the highest pending
interrupt level to be serviced. No other interrupts are acknowledged until the pending
interrupt is serviced. Whenever the interrupt status register is read, the interrupt status is
cleared. However, it should be noted that only the current pending interrupt is cleared by
the read. A lower level interrupt may be seen after re-reading the interrupt status bits.
Table 13 “Interrupt source” shows the data values (bits 0:5) for the six prioritized interrupt
levels and the interrupt sources associated with each of these interrupt levels.
Table 13.
Interrupt source
Priority
level
ISR[5]
ISR[4]
ISR[3]
ISR[2]
ISR[1]
ISR[0]
Source of the interrupt
1
0
0
0
1
1
0
LSR (receiver Line Status
Register)
2
0
0
0
1
0
0
RXRDY (Received Data Ready)
2
0
0
1
1
0
0
RXRDY (Receive Data time-out)
3
0
0
0
0
1
0
TXRDY (Transmitter Holding
Register Empty)
4
0
0
0
0
0
0
MSR (Modem Status Register)
5
0
1
0
0
0
0
RXRDY (Received Xoff signal) /
Special character
6
1
0
0
0
0
0
CTS, RTS change of state
Table 14.
Interrupt Status Register bits description
Bit
Symbol
Description
7:6
ISR[7:6]
FIFOs enabled. These bits are set to a logic 0 when the FIFO is not being
used. They are set to a logic 1 when the FIFOs are enabled.
5:4
ISR[5:4]
INT priority bits 4:3. These bits are enabled when EFR[4] is set to a logic 1.
ISR[4] indicates that matching Xoff character(s) have been detected. ISR[5]
indicates that CTS, RTS have been generated. Note that once set to a
logic 1, the ISR[4] bit will stay a logic 1 until Xon character(s) are received.
logic 0 or cleared = default condition
logic 0 or cleared = default condition
3:1
ISR[3:1]
INT priority bits 2:0. These bits indicate the source for a pending interrupt at
interrupt priority levels 1, 2, and 3 (see Table 13).
logic 0 or cleared = default condition
0
ISR[0]
INT status.
logic 0 = an interrupt is pending and the ISR contents may be used as a
pointer to the appropriate interrupt service routine.
logic 1 = no interrupt pending (normal default condition)
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
21 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
7.5 Line Control Register (LCR)
The Line Control Register is used to specify the asynchronous data communication
format. The word length, the number of stop bits, and the parity are selected by writing the
appropriate bits in this register.
Table 15.
Line Control Register bits description
Bit
Symbol
Description
7
LCR[7]
Divisor latch enable. The internal baud rate counter latch and Enhanced
Feature mode enable.
logic 0 = divisor latch disabled (normal default condition)
logic 1 = divisor latch and enhanced feature register enabled
6
LCR[6]
Set break. When enabled, the Break control bit causes a break condition to
be transmitted (the TX output is forced to a logic 0 state). This condition exists
until disabled by setting LCR[6] to a logic 0.
logic 0 = no TX break condition (normal default condition)
logic 1 = forces the transmitter output (TX) to a logic 0 for alerting the
remote receiver to a line break condition
5
LCR[5]
Set parity. If the parity bit is enabled, LCR[5] selects the forced parity format.
Programs the parity conditions (see Table 16).
logic 0 = parity is not forced (normal default condition)
LCR[5] = logic 1 and LCR[4] = logic 0: parity bit is forced to a logic 1 for the
transmit and receive data
LCR[5] = logic 1 and LCR[4] = logic 1: parity bit is forced to a logic 0 for the
transmit and receive data
4
LCR[4]
Even parity. If the parity bit is enabled with LCR[3] set to a logic 1, LCR[4]
selects the even or odd parity format.
logic 0 = odd parity is generated by forcing an odd number of logic 1s in the
transmitted data. The receiver must be programmed to check the same
format (normal default condition).
logic 1 = even parity is generated by forcing an even number of logic 1s in
the transmitted data. The receiver must be programmed to check the same
format.
3
LCR[3]
Parity enable. Parity or no parity can be selected via this bit.
logic 0 = no parity (normal default condition)
logic 1 = a parity bit is generated during the transmission, receiver checks
the data and parity for transmission errors
2
LCR[2]
Stop bits. The length of stop bit is specified by this bit in conjunction with the
programmed word length (see Table 17).
logic 0 or cleared = default condition
1:0
LCR[1:0]
Word length bits 1, 0. These two bits specify the word length to be transmitted
or received (see Table 18).
logic 0 or cleared = default condition
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
22 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 16.
LCR[5] parity selection
LCR[5]
LCR[4]
LCR[3]
Parity selection
X
X
0
no parity
0
0
1
odd parity
0
1
1
even parity
1
0
1
force parity ‘1’
1
1
1
forced parity ‘0’
Table 17.
LCR[2] stop bit length
LCR[2]
Word length
Stop bit length (bit times)
0
5, 6, 7, 8
1
1
5
1-1⁄2
1
6, 7, 8
2
Table 18.
LCR[1:0] word length
LCR[1]
LCR[0]
Word length
0
0
5
0
1
6
1
0
7
1
1
8
7.6 Modem Control Register (MCR)
This register controls the interface with the modem or a peripheral device.
Table 19.
Modem Control Register bits description
Bit
Symbol
Description
7
MCR[7]
Clock select.
logic 0 = divide-by-1. The input clock (crystal or external) is divided by 16 and
then presented to the programmable Baud Rate Generator (BGR) without
further modification, i.e., divide-by-1 (normal default condition).
logic 1 = divide-by-4. The divide-by-1 clock described in MCR[7] equals a
logic 0, is further divided by four (see also Section 6.7 “Programmable baud
rate generator”).
6
MCR[6]
IR enable.
logic 0 = enable the standard modem receive and transmit input/output
interface (normal default condition)
logic 1 = enable infrared IrDA receive and transmit inputs/outputs. While in this
mode, the TX/RX output/inputs are routed to the infrared encoder/decoder.
The data input and output levels will conform to the IrDA infrared interface
requirement. As such, while in this mode, the infrared TX output will be a
logic 0 during idle data conditions.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
23 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 19.
Modem Control Register bits description …continued
Bit
Symbol
Description
5
MCR[5]
INT type select.
logic 0 = enable interrupt output mode (normal default condition)
logic 1 = enable open source interrupt output mode. Provides shared
interrupts by producing a wire-OR output driver capability for interrupts. This
output appears at the INT pin. When using this option, an external pull-down
resistor of 200 Ω to 500 Ω must be tied from the INT pin to ground to provide
an acceptable logic 0 level
4
MCR[4]
Loopback. Enable the local loopback mode (diagnostics). In this mode the
transmitter output (TX) and the receiver input (RX), CTS, DSR, DCD, and RI are
disconnected from the SC16C650B I/O pins. Internally the modem data and
control pins are connected into a loopback data configuration (see Figure 7). In
this mode, the receiver and transmitter interrupts remain fully operational. The
Modem Control Interrupts are also operational, but the interrupts’ sources are
switched to the lower four bits of the Modem Control. Interrupts continue to be
controlled by the IER register.
logic 0 = disable loopback mode (normal default condition)
logic 1 = enable local loopback mode (diagnostics)
3
MCR[3]
OUT2. In the loopback mode this bit is used to control the modem DCD signal
via OUT2.
logic 0 = OUT2 is at logic 1. In the loopback mode, sets OUT2 (DCD)
internally to a logic 1.
logic 1 = OUT2 is at logic 0. In the loopback mode, sets OUT2 (DCD)
internally to a logic 0.
2
MCR[2]
OUT1, OUT. In the loopback mode, this bit is used to control modem RI interface
signal via OUT1 (OUT in the HVQFN32 package).
logic 0 = OUT1/OUT is at logic 1. In the loopback mode, sets RI internally to
logic 1.
logic 1 = OUT1/OUT is set at logic 0. In the loopback mode, sets RI internally
to logic 0.
1
MCR[1]
RTS
logic 0 = force RTS output to a logic 1 (normal default condition)
logic 1 = force RTS output to a logic 0
0
MCR[0]
DTR
logic 0 = force DTR output to a logic 1 (normal default condition)
logic 1 = force DTR output to a logic 0
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
24 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
7.7 Line Status Register (LSR)
This register provides the status of data transfers between the SC16C650B and the CPU.
Table 20.
Line Status Register bits description
Bit
Symbol
Description
7
LSR[7]
FIFO data error.
logic 0 = no error (normal default condition)
logic 1 = at least one parity error, framing error or break indication is in the
current FIFO data. This bit is cleared when LSR register is read.
6
LSR[6]
THR and TSR empty. This bit is the Transmit Empty indicator. This bit is set to a
logic 1 whenever the transmit holding register and the transmit shift register are
both empty. It is reset to logic 0 whenever either the THR or TSR contains a
data character. In the FIFO mode, this bit is set to ‘1’ whenever the transmit
FIFO and transmit shift register are both empty.
5
LSR[5]
THR empty. This bit is the Transmit Holding Register Empty indicator. This bit
indicates that the UART is ready to accept a new character for transmission. In
addition, this bit causes the UART to issue an interrupt to CPU when the THR
interrupt enable is set. The THR bit is set to a logic 1 when a character is
transferred from the transmit holding register into the transmitter shift register.
The bit is reset to a logic 0 concurrently with the loading of the transmit holding
register by the CPU. In the FIFO mode, this bit is set when the transmit FIFO is
empty; it is cleared when at least 1 byte is written to the transmit FIFO.
4
LSR[4]
Break interrupt.
logic 0 = no break condition (normal default condition)
logic 1 = the receiver received a break signal (RX was a logic 0 for one
character frame time). In the FIFO mode, only one break character is loaded
into the FIFO.
3
LSR[3]
Framing error.
logic 0 = no framing error (normal default condition)
logic 1 = framing error. The receive character did not have a valid stop bit(s).
In the FIFO mode, this error is associated with the character at the top of the
FIFO.
2
LSR[2]
Parity error.
logic 0 = no parity error (normal default condition)
logic 1 = parity error. The receive character does not have correct parity
information and is suspect. In the FIFO mode, this error is associated with
the character at the top of the FIFO.
1
LSR[1]
Overrun error.
logic 0 = no overrun error (normal default condition).
logic 1 = overrun error. A data overrun error occurred in the receive shift
register. This happens when additional data arrives while the FIFO is full. In
this case, the previous data in the shift register is overwritten. Note that under
this condition, the data byte in the receive shift register is not transferred into
the FIFO, therefore the data in the FIFO is not corrupted by the error.
0
LSR[0]
Receive data ready.
logic 0 = no data in receive holding register or FIFO (normal default
condition)
logic 1 = data has been received and is saved in the receive holding register
or FIFO
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
25 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
7.8 Modem Status Register (MSR)
This register provides the current state of the control interface signals from the modem, or
other peripheral device to which the SC16C650B is connected. Four bits of this register
are used to indicate the changed information. These bits are set to a logic 1 whenever a
control input from the modem changes state. These bits are set to a logic 0 whenever the
CPU reads this register.
Table 21.
Modem Status Register bits description
Bit
Symbol
Description
7
MSR[7]
Data Carrier Detect. DCD (active HIGH, logic 1). Normally this bit is the
complement of the DCD input. In the loopback mode this bit is equivalent to the
OUT2 bit in the MCR register.
6
MSR[6]
Ring Indicator. RI (active HIGH, logic 1). Normally this bit is the complement of
the RI input. In the loopback mode this bit is equivalent to the OUT1 bit in the
MCR register.
5
MSR[5]
Data Set Ready. DSR (active HIGH, logic 1). Normally this bit is the
complement of the DSR input. In loopback mode this bit is equivalent to the
DTR bit in the MCR register.
4
MSR[4]
Clear To Send. CTS. CTS functions as hardware flow control signal input if it is
enabled via EFR[7]. Flow control (when enabled) allows starting and stopping
the transmissions based on the external modem CTS signal. A logic 1 at the
CTS pin will stop SC16C650B transmissions as soon as current character has
finished transmission. Normally MSR[4] is the complement of the CTS input.
However, in the loopback mode, this bit is equivalent to the RTS bit in the MCR
register.
3
MSR[3]
∆DCD [1]
logic 0 = no DCD change (normal default condition)
logic 1 = the DCD input to the SC16C650B has changed state since the last
time it was read. A modem Status Interrupt will be generated.
2
MSR[2]
∆RI [1]
logic 0 = no RI change (normal default condition)
logic 1 = the RI input to the SC16C650B has changed from a logic 0 to a
logic 1. A modem Status Interrupt will be generated.
1
MSR[1]
∆DSR [1]
logic 0 = no DSR change (normal default condition)
logic 1 = the DSR input to the SC16C650B has changed state since the last
time it was read. A modem Status Interrupt will be generated.
0
MSR[0]
∆CTS [1]
logic 0 = no CTS change (normal default condition)
logic 1 = the CTS input to the SC16C650B has changed state since the last
time it was read. A modem Status Interrupt will be generated.
[1]
Whenever any MSR bit 3:0 is set to logic 1, a Modem Status Interrupt will be generated.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
26 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
7.9 Scratchpad Register (SPR)
The SC16C650B provides a temporary data register to store 8 bits of user information.
7.10 Enhanced Feature Register (EFR)
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 22.
Enhanced Feature Register bits description
Bit
Symbol
Description
7
EFR[7]
Automatic CTS flow control.
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 logic 1. Transmission will resume when the CTS pin returns to
a logic 0.
6
EFR[6]
Automatic RTS flow control. 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.
0 = Automatic RTS flow control is disabled (normal default condition)
1 = enable Automatic RTS flow control
5
EFR[5]
Special Character Detect.
logic 0 = special character detect disabled (normal default condition)
logic 1 = special character detect enabled. The SC16C650B compares each
incoming receive character with Xoff2 data. If a match exists, the received
data will be transferred to FIFO and ISR[4] will be set to indicate detection of
special character. Bit 0 in the X-registers corresponds with the LSB bit for the
receive character. When this feature is enabled, the normal software flow
control must be disabled (EFR[3:0] must be set to a logic 0).
4
EFR[4]
Enhanced function control bit. The content of IER[7:4], ISR[5:4], FCR[5:4], and
MCR[7:5] can be modified and latched. After modifying any bits in the
enhanced registers, EFR[4] can be set to a logic 0 to latch the new values. This
feature prevents existing software from altering or overwriting the SC16C650B
enhanced functions.
logic 0 = disable (normal default condition)
logic 1 = enable
3:0
EFR[3:0]
Cont-3:0 Tx, Rx control. Logic 0 or cleared is the default condition.
Combinations of software flow control can be selected by programming these
bits. See Table 23.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
27 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Software flow control functions[1]
Table 23.
Cont-3
Cont-2
Cont-1
Cont-0
TX, RX software flow controls
0
0
X
X
No transmit flow control
1
0
X
X
Transmit Xon1/Xoff1
0
1
X
X
Transmit Xon2/Xoff2
1
1
X
X
Transmit Xon1 and Xon2/Xoff1 and Xoff2
X
X
0
0
No receive flow control
X
X
1
0
Receiver compares Xon1/Xoff1
X
X
0
1
Receiver compares Xon2/Xoff2
1
0
1
1
Transmit Xon1/Xoff1
Receiver compares Xon1 and Xon2, Xoff1 and Xoff2
0
1
1
1
Transmit Xon2/Xoff2
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
1
1
1
1
Transmit Xon1 and Xon2/Xoff1 and Xoff2
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
[1]
When using a software flow control the Xon/Xoff characters cannot be used for data transfer.
7.11 SC16C650B external reset conditions
Table 24.
Reset state for registers
Register
Reset state
IER
IER[7:0] = 0
ISR
ISR[7:1] = 0; ISR[0] = 1
LCR
LCR[7:0] = 0
MCR
MCR[7:0] = 0
LSR
LSR[7] = 0; LSR[6:5] = 1; LSR[4:0] = 0
MSR
MSR[7:4] = input signals; MSR[3:0] = 0
FCR
FCR[7:0] = 0
EFR
EFR[7:0] = 0
Table 25.
Reset state for outputs
Output
Reset state
TX
HIGH
RTS
HIGH
DTR
HIGH
RXRDY
HIGH
TXRDY
LOW
INT
LOW
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
28 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
8. Limiting values
Table 26. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
VCC
supply voltage
Vn
voltage on any other pin
Conditions
Min
Max
Unit
-
7
V
at D7 to D0
GND − 0.3
VCC + 0.3
V
at any input only pin
GND − 0.3
5.3
V
operating in free air
−40
+85
°C
Tamb
ambient temperature
Tstg
storage temperature
−65
+150
°C
Ptot/pack
total power dissipation per package
-
500
mW
9. Static characteristics
Table 27. Static characteristics
Tamb = −40 °C to +85 °C; tolerance of VCC ± 10 %, unless otherwise specified.
Symbol
Parameter
Conditions
VCC = 2.5 V
VCC = 3.3 V
VCC = 5.0 V
Min
Max
Min
Max
Min
Max
Unit
VIL(clk)
clock LOW-level input
voltage
−0.3
+0.45
−0.3
+0.6
−0.5
+0.6
V
VIH(clk)
clock HIGH-level input
voltage
1.8
VCC
2.4
VCC
3.0
VCC
V
VIL
LOW-level input voltage
−0.3
+0.65
−0.3
+0.8
−0.5
+0.8
V
VIH
HIGH-level input voltage
1.6
-
2.0
-
2.2
VCC
V
VOL
LOW-level output voltage
IOL = 5 mA (data bus)
-
-
-
-
-
0.4
V
IOL = 4 mA
(other outputs)
-
-
-
0.4
-
-
V
IOL = 2 mA (data bus)
-
0.4
-
-
-
-
V
IOL = 1.6 mA
(other outputs)
-
0.4
-
-
-
-
V
VOH
HIGH-level output voltage
ILIL
LOW-level input leakage
current
IL(clk)
clock leakage current
ICC(AV)
average supply current
ICC(sleep)
sleep mode supply current
Ci
input capacitance
Rpu(int)
internal pull-up resistance
[1]
on all outputs
[1]
IOH = −5 mA (data bus)
-
-
-
-
2.4
-
V
IOH = −1 mA
(other outputs)
-
-
2.0
-
-
-
V
IOH = −800 µA (data bus)
1.85
-
-
-
-
-
V
IOH = −400 µA
(other outputs)
1.85
-
-
-
-
-
V
-
±10
-
±10
-
±10
µA
f = 5 MHz
f = 5 MHz
[2]
-
±30
-
±30
-
±30
µA
-
3.5
-
4.5
-
4.5
mA
-
50
-
50
-
50
µA
-
5
-
5
-
5
pF
500
-
500
-
500
-
kΩ
Except for XTAL2, VOL = 1 V typically.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
29 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
[2]
Sleep current might be higher if there is activity on the data bus during Sleep mode.
10. Dynamic characteristics
Table 28. Dynamic characteristics
Tamb = −40 °C to +85 °C; tolerance of VCC ± 10 %, unless otherwise specified.
Symbol
Parameter
Conditions
VCC = 2.5 V
VCC = 3.3 V
VCC = 5.0 V
Min
Max
Min
Max
Min
Max
15
-
13
-
10
-
15
-
13
-
10
-
-
16
-
32
-
48
Unit
tWL
pulse width LOW
tWH
pulse width HIGH
fXTAL1
frequency on pin XTAL1
t4w
address strobe width
45
-
35
-
25
-
ns
t5s
address set-up time
5
-
5
-
1
-
ns
t5h
address hold time
5
-
5
-
5
-
ns
t6s
chip select set-up time to AS
10
-
5
-
0
-
ns
t6h
address hold time
0
-
0
-
0
-
ns
10
-
10
-
5
-
ns
t6s'
address set-up time
[1]
[2]
ns
ns
MHz
t6h
chip select hold time
0
-
0
-
0
-
ns
t7d
IOR delay from chip select
10
-
10
-
10
-
ns
t7w
IOR strobe width
77
-
26
-
23
-
ns
t7h
chip select hold time from
IOR
0
-
0
-
0
-
ns
t7h'
address hold time
5
-
5
-
5
-
ns
t8d
IOR delay from address
10
-
10
-
10
-
ns
t9d
read cycle delay
20
-
20
-
20
-
ns
t11d
IOR to DDIS delay
25 pF load
-
100
-
35
-
30
ns
t12d
delay from IOR to data
25 pF load
-
77
-
26
-
23
ns
t12h
data disable time
25 pF load
-
15
-
15
-
15
ns
t13d
IOW delay from chip select
10
-
10
-
10
-
ns
t13w
IOW strobe width
20
-
20
-
15
-
ns
t13h
chip select hold time from
IOW
0
-
0
-
0
-
ns
t14d
IOW delay from address
10
-
10
-
10
-
ns
25 pF load
[2]
25 pF load
t15d
write cycle delay
25
-
25
-
20
-
ns
t16s
data set-up time
20
-
20
-
15
-
ns
t16h
data hold time
15
-
5
-
5
-
ns
t17d
delay from IOW to output
25 pF load
-
100
-
33
-
29
ns
t18d
delay to set interrupt from
Modem input
25 pF load
-
100
-
24
-
23
ns
t19d
delay to reset interrupt from
IOR
25 pF load
-
100
-
24
-
23
ns
t20d
delay from stop to set
interrupt
-
1TRCLK
-
1TRCLK
-
1TRCLK
s
t21d
delay from IOR to reset
interrupt
-
100
-
29
-
28
ns
[3]
25 pF load
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
30 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 28. Dynamic characteristics …continued
Tamb = −40 °C to +85 °C; tolerance of VCC ± 10 %, unless otherwise specified.
Symbol
Parameter
t22d
delay from start to set
interrupt
t23d
delay from IOW to transmit
start
t24d
delay from IOW to reset
interrupt
t25d
delay from stop to set
RXRDY
t26d
Conditions
VCC = 2.5 V
[3]
VCC = 3.3 V
VCC = 5.0 V
Min
Max
Min
Max
Min
Max
-
100
-
45
-
40
Unit
ns
8TRCLK 24TRCLK 8TRCLK 24TRCLK 8TRCLK 24TRCLK s
-
100
-
45
-
40
ns
-
1TRCLK
-
1TRCLK
-
1TRCLK
s
delay from IOR to reset
RXRDY
-
100
-
45
-
40
ns
t27d
delay from IOW to set
TXRDY
-
100
-
45
-
40
ns
t28d
delay from start to reset
TXRDY
[3]
-
8TRCLK
-
8TRCLK
-
8TRCLK
s
tRESET
RESET pulse width
[4]
100
-
40
-
40
-
ns
N
[1]
[3]
baud rate divisor
1
216
−1
1
216
−1
1
216
−1
Applies to external clock; crystal oscillator max 24 MHz.
[2]
Applicable only when AS is tied LOW.
[3]
RCLK is an internal signal derived from Divisor Latch LSB (DLL) and Divisor Latch MSB (DLM) divisor latches.
[4]
RESET pulse must happen when these signals are inactive: CS, CS0, CS1, CS2, IOR, IOR, IOW, IOW.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
31 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
10.1 Timing diagrams
t4w
AS
t5s
t5h
valid
address
A0 to A2
t6s
t6h
CS2
CS1, CS0
valid
t7d
t7h
t7w
t8d
t9d
active
IOR, IOR
t11d
t11h
active
DDIS
t12h
t12d
D0 to D7
data
002aaa331
Fig 8.
General read timing when using AS signal
t4w
AS
t5s
t5h
valid
address
A0 to A2
t6s
CS2
CS1, CS0
valid
t13d
t14d
IOW, IOW
t6h
t13h
t13w
t15d
active
t16s
D0 to D7
t16h
data
002aaa332
Fig 9.
General write timing when using AS signal
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
32 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
valid
address
A0 to A2
valid
address
t6s'
t6s'
t7h'
active
CS
t7h'
t7w
active
t7w
t9d
active
IOR
t12h
t12d
D0 to D7
t12d
t12h
data
002aaa333
Fig 10. General read timing when AS is tied to GND
valid
address
A0 to A2
valid
address
t6s'
CS
t7h'
active
active
t13w
IOW
t15d
t13w
active
t16s
D0 to D7
t7h'
t6s'
t16h
t16s
t16h
data
002aaa334
Fig 11. General write timing when AS is tied to GND
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
33 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
IOW
active
t17d
RTS
DTR
change of state
change of state
DCD
CTS
DSR
change of state
t18d
t18d
INT
change of state
active
active
active
t19d
active
IOR
active
active
t18d
change of state
RI
002aaa347
Fig 12. Modem input/output timing
tWL
tWH
external clock
tw(clk)
002aac357
1
f XTAL1 = --------------t w ( clk )
Fig 13. External clock timing
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
34 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
start
bit
RX
parity
bit
data bits (0 to 7)
D0
D1
D2
D3
D4
D5
D6
stop
bit
next
data
start
bit
D7
5 data bits
6 data bits
t20d
7 data bits
active
INT
t21d
active
IOR
16 baud rate clock
002aaa113
Fig 14. Receive timing
start
bit
RX
parity
bit
data bits (0 to 7)
D0
D1
D2
D3
D4
D5
D6
stop
bit
next
data
start
bit
D7
t25d
active data
ready
RXRDY
t26d
active
IOR
002aab063
Fig 15. Receive ready timing in non-FIFO mode
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
35 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
start
bit
D0
RX
parity
bit
data bits (0 to 7)
D1
D2
D3
D4
D5
D6
stop
bit
D7
first byte that
reaches the
trigger level
t25d
active data
ready
RXRDY
t26d
active
IOR
002aab064
Fig 16. Receive ready timing in FIFO mode
start
bit
TX
parity
bit
data bits (0 to 7)
D0
D1
D2
D3
D4
D5
D6
stop
bit
next
data
start
bit
D7
5 data bits
6 data bits
7 data bits
active
transmitter ready
INT
t22d
t24d
t23d
IOW
active
active
16 baud rate clock
002aaa116
Fig 17. Transmit timing
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
36 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
start
bit
TX
D0
IOW
active
D0 to D7
byte #1
parity
bit
data bits (0 to 7)
D1
D2
D3
D4
D5
D6
stop
bit
next
data
start
bit
D7
t28d
t27d
active
transmitter ready
TXRDY
transmitter
not ready
002aaa580
Fig 18. Transmit ready timing in non-FIFO mode
start
bit
data bits (0 to 7)
D0
TX
parity
bit
D1
D2
D3
D4
D5
D6
stop
bit
D7
5 data bits
6 data bits
7 data bits
IOW
active
t28d
D0 to D7
byte #32
t27d
TXRDY
FIFO full
002aad685
Fig 19. Transmit ready timing in FIFO mode (DMA mode ‘1’)
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
37 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
UART frame
start
data bits
0
TX data
1
0
1
0
stop
0
1
1
0
1
IrDA TX data
1/ bit time
2
bit
time
3/ bit time
16
002aaa212
Fig 20. Infrared transmit timing
IrDA RX data
bit
time
RX data
0 to 1 16× clock delay
0
1
0
1
start
0
0
data bits
1
1
0
1
stop
UART frame
002aaa213
Fig 21. Infrared receive timing
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
38 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
11. Package outline
PLCC44: plastic leaded chip carrier; 44 leads
SOT187-2
eD
eE
y
X
39
A
29
28
40
bp
ZE
b1
w M
44
1
E
HE
pin 1 index
A
A4 A1
e
(A 3)
6
β
18
Lp
k
7
detail X
17
e
v M A
ZD
D
B
HD
v M B
0
5
10 mm
scale
DIMENSIONS (mm dimensions are derived from the original inch dimensions)
A4
A1
e
UNIT A
A3
D(1) E(1)
eD
eE
HD
bp b1
max.
min.
4.57
4.19
mm
inches
0.81
0.66
HE
k
16.66 16.66
16.00 16.00 17.65 17.65 1.22
1.27
16.51 16.51
14.99 14.99 17.40 17.40 1.07
0.51
0.25
3.05
0.53
0.33
0.180
0.02
0.165
0.01
0.12
0.021 0.032 0.656 0.656
0.05
0.013 0.026 0.650 0.650
0.63
0.59
0.63
0.59
Lp
v
w
y
1.44
1.02
0.18
0.18
0.1
ZD(1) ZE(1)
max. max.
2.16
β
2.16
45 o
0.695 0.695 0.048 0.057
0.007 0.007 0.004 0.085 0.085
0.685 0.685 0.042 0.040
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
JEITA
SOT187-2
112E10
MS-018
EDR-7319
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
01-11-14
Fig 22. Package outline SOT187-2 (PLCC44)
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
39 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
LQFP48: plastic low profile quad flat package; 48 leads; body 7 x 7 x 1.4 mm
SOT313-2
c
y
X
36
25
A
37
24
ZE
e
E HE
A A2
(A 3)
A1
w M
θ
bp
pin 1 index
Lp
L
13
48
1
detail X
12
ZD
e
v M A
w M
bp
D
B
HD
v M B
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (1)
e
HD
HE
L
Lp
v
w
y
mm
1.6
0.20
0.05
1.45
1.35
0.25
0.27
0.17
0.18
0.12
7.1
6.9
7.1
6.9
0.5
9.15
8.85
9.15
8.85
1
0.75
0.45
0.2
0.12
0.1
Z D (1) Z E (1)
θ
0.95
0.55
7
o
0
0.95
0.55
o
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT313-2
136E05
MS-026
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
00-01-19
03-02-25
Fig 23. Package outline SOT313-2 (LQFP48)
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
40 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
HVQFN32: plastic thermal enhanced very thin quad flat package; no leads;
32 terminals; body 5 x 5 x 0.85 mm
A
B
D
SOT617-1
terminal 1
index area
A
A1
E
c
detail X
C
e1
e
1/2 e
16
y
y1 C
v M C A B
w M C
b
9
L
17
8
e
e2
Eh
1/2 e
1
terminal 1
index area
24
32
25
X
Dh
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A(1)
max.
A1
b
c
D (1)
Dh
E (1)
Eh
e
e1
e2
L
v
w
y
y1
mm
1
0.05
0.00
0.30
0.18
0.2
5.1
4.9
3.25
2.95
5.1
4.9
3.25
2.95
0.5
3.5
3.5
0.5
0.3
0.1
0.05
0.05
0.1
Note
1. Plastic or metal protrusions of 0.075 mm maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
JEITA
SOT617-1
---
MO-220
---
EUROPEAN
PROJECTION
ISSUE DATE
01-08-08
02-10-18
Fig 24. Package outline SOT617-1 (HVQFN32)
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
41 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
12. Soldering of SMD packages
This text provides a very brief insight into a complex technology. A more in-depth account
of soldering ICs can be found in Application Note AN10365 “Surface mount reflow
soldering description”.
12.1 Introduction to soldering
Soldering is one of the most common methods through which packages are attached to
Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both
the mechanical and the electrical connection. There is no single soldering method that is
ideal for all IC packages. Wave soldering is often preferred when through-hole and
Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not
suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high
densities that come with increased miniaturization.
12.2 Wave and reflow soldering
Wave soldering is a joining technology in which the joints are made by solder coming from
a standing wave of liquid solder. The wave soldering process is suitable for the following:
• Through-hole components
• Leaded or leadless SMDs, which are glued to the surface of the printed circuit board
Not all SMDs can be wave soldered. Packages with solder balls, and some leadless
packages which have solder lands underneath the body, cannot be wave soldered. Also,
leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered,
due to an increased probability of bridging.
The reflow soldering process involves applying solder paste to a board, followed by
component placement and exposure to a temperature profile. Leaded packages,
packages with solder balls, and leadless packages are all reflow solderable.
Key characteristics in both wave and reflow soldering are:
•
•
•
•
•
•
Board specifications, including the board finish, solder masks and vias
Package footprints, including solder thieves and orientation
The moisture sensitivity level of the packages
Package placement
Inspection and repair
Lead-free soldering versus SnPb soldering
12.3 Wave soldering
Key characteristics in wave soldering are:
• Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are
exposed to the wave
• Solder bath specifications, including temperature and impurities
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
42 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
12.4 Reflow soldering
Key characteristics in reflow soldering are:
• Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 25) than a SnPb process, thus
reducing the process window
• Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
• Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 29 and 30
Table 29.
SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
≥ 350
< 2.5
235
220
≥ 2.5
220
220
Table 30.
Lead-free process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
350 to 2000
> 2000
< 1.6
260
260
260
1.6 to 2.5
260
250
245
> 2.5
250
245
245
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reflow
soldering, see Figure 25.
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
43 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
maximum peak temperature
= MSL limit, damage level
temperature
minimum peak temperature
= minimum soldering temperature
peak
temperature
time
001aac844
MSL: Moisture Sensitivity Level
Fig 25. Temperature profiles for large and small components
For further information on temperature profiles, refer to Application Note AN10365
“Surface mount reflow soldering description”.
13. Abbreviations
Table 31.
Abbreviations
Acronym
Description
CPU
Central Processing Unit
DLL
Divisor Latch LSB
DLM
Divisor Latch MSB
DMA
Direct Memory Access
FIFO
First-In, First-Out
ISDN
Integrated Service Digital Network
LSB
Least Significant Bit
MSB
Most Significant Bit
TTL
Transistor-Transistor Logic
14. Revision history
Table 32.
Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
SC16C650B_4
20090914
Product data sheet
-
SC16C650B-03
Modifications:
•
The format of this data sheet has been redesigned to comply with the new identity guidelines of
NXP Semiconductors.
•
•
Legal texts have been adapted to the new company name where appropriate.
DIP40 package option (type number SC16C650BIN40) removed
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
44 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 32.
Revision history …continued
Document ID
Modifications:
Release date
•
•
Data sheet status
Change notice
Supersedes
Section 2 “Features”, 3rd bullet: changed from “5 V tolerant inputs” to “5 V tolerant on input only
pins”, and added Footnote 1.
Table 2 “Pin description”:
– added (new) Table note [1] and its reference at HVQFN32 pin 13 (GND)
– Description for signal DDIS changed from “DDIS is active (LOW) when the CPU is not reading
data. When active, DDIS can disable an external transceiver.” to “DDIS is active (LOW) when
the CPU is reading data. When inactive (HIGH), DDIS can disable an external transceiver.”
•
Section 6.8 “DMA operation”:
– 3rd sentence: changed from “... the state of the RXRDY and TXRDY output pins.” to “... the
state of the RXRDY and TXRDY output pins.”
– added Remark
•
Section 7 “Register descriptions”:
– first paragraph: changed from “... for the fifteen SC16C650B internal registers.” to “... for the
seventeen SC16C650B internal registers.”
•
Table 8 “SC16C650B internal registers”:
– descriptive text below table title moved to (new) Table note [3]
– removed shading from 9 table cells; added reference to Table note [3]
– deleted reference to Table note [4] at MCR[2]
– Table note [4] changed from “These functions are not supported ...” to “This function is not
supported ...”
– added (new) Table note [5] and its reference at MCR[3]
– added (new) Table note [6] and its reference at FCR[3] and MCR[2]
– MCR bit 2 changed from “OUT1” to “OUT1, OUT”
– MCR bit 3 changed from “OUT2, INT enable” to “OUT2”
•
Table 19 “Modem Control Register bits description”:
– description of MCR[5]: removed references to IRQA pin
– description of MCR[5]: logic 0: changed from “enable active or 3-State interrupt output mode”
to “enable interrupt output mode”
– description of MCR[5]: logic 1, second sentence changed from “Provides shared interrupts in
the STD mode by producing ...” to “Provides shared interrupts by producing ...”
– description of MCR[3] re-written
– description of MCR[2] re-written
•
Table 25 “Reset state for outputs”: deleted “(STD mode)” from the Reset state column for RXRDY,
TXRDY and INT outputs
•
Table 26 “Limiting values”:
– parameter description for symbol Vn changed from “voltage at any pin” to “voltage on any other
pin”; added separate conditions for “at D7 to D0” and “at any input only pin”
– parameter description for symbol Tamb changed from “operating temperature” to “ambient
temperature”; added condition “operating in free air”
– symbol for ‘total power dissipation per package” changed from “Ptot(pack)” to “Ptot/pack”
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
45 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
Table 32.
Revision history …continued
Document ID
Modifications:
(continued)
Release date
•
Data sheet status
Change notice
Supersedes
Table 27 “Static characteristics”:
– table title changed (was “DC electrical characteristics”)
– descriptive text below table title changed from “VCC = 2.5 V, 3.3 V or 5.0 V ±10%” to “tolerance
of VCC ± 10 %”
– symbol “VIL(CK)” changed to “VIL(clk)”
– symbol “VIH(CK)” changed to “VIH(clk)”
– parameter description for VOL: moved “on all outputs” to Conditions column
– symbol/parameter “ICL, clock leakage” changed to “IL(clk), clock leakage current”
– symbol/parameter “ICC, average power supply current” changed to “ICC(AV), average supply
current”
– added ICC(sleep) specification
– Table note [1]: changed “x2” to “XTAL2”
– (old) Table note [2] deleted (and its reference at Rpu(int))
– added (new) Table note [2] and its reference at ICC(sleep)
•
Table 28 “Dynamic characteristics”:
– table title changed (was “AC electrical characteristics”
– descriptive text below table title changed from “VCC = 2.5 V, 3.3 V or 5.0 V ±10%” to “tolerance
of VCC ± 10 %”
– symbol “t1w, t2w, clock pulse duration” is split into two parameters “tWH, pulse width HIGH” and
“tWL, pulse width LOW”
– symbol “t3w, oscillator/clock frequency” changed to “fXTAL1, frequency on pin XTAL1”
– symbols t20d, t23d, t25d, t28d: unit changed from “Rclk” to “s”; values are appended with “TRCLK”
and referenced to (new) Table note [3]
– parameter description for tRESET changed from “Reset pulse width” to “RESET pulse width”;
added reference to (new) Table note [4]
– unit for parameter “baud rate divisor”: deleted “Rclk” (N is a number)
•
Figure 13 “External clock timing”:
– symbol changed from “t1w” to “tWH”
– symbol changed from “t2w” to “tWL”
– symbol changed from “t3w” to “tw(clk)”
– added equation
•
•
SC16C650B-03
(9397 750 14451)
Modifications:
Figure 15, Figure 16, Figure 18, Figure 19: changed from “DATA BITS (5-8)” to “data bits (0 to 7)”
Figure 19: in waveform for signals D0 to D7, changed “BYTE #16” to “byte #32”
20041210
•
Product data
-
SC16C650B-02
There is no modification to the data sheet. However, reader is advised to refer to AN10333
(Rev. 02) “SC16CXXXB baud rate deviation tolerance” (9397 750 14411) that was released
together with this revision.
SC16C650B-02
(9397 750 13317)
20040603
Product data
-
SC16C650B-01
SC16C650B-01
(9397 750 11994)
20040330
Product data
-
-
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
46 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
15. Legal information
15.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
15.3 Disclaimers
General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors accepts no liability for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at http://www.nxp.com/profile/terms, including those pertaining to warranty,
intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.
No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from national authorities.
15.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
16. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
SC16C650B_4
Product data sheet
© NXP B.V. 2009. All rights reserved.
Rev. 04 — 14 September 2009
47 of 48
SC16C650B
NXP Semiconductors
UART with 32-byte FIFOs and IrDA encoder/decoder
17. Contents
1
2
3
4
5
5.1
5.2
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
7
7.1
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functional description . . . . . . . . . . . . . . . . . . . 8
Internal registers. . . . . . . . . . . . . . . . . . . . . . . . 9
FIFO operation . . . . . . . . . . . . . . . . . . . . . . . . . 9
Hardware flow control . . . . . . . . . . . . . . . . . . . 10
Software flow control . . . . . . . . . . . . . . . . . . . 10
Special feature software flow control . . . . . . . 11
Hardware/software and time-out interrupts. . . 11
Programmable baud rate generator . . . . . . . . 12
DMA operation . . . . . . . . . . . . . . . . . . . . . . . . 14
Sleep mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Loopback mode . . . . . . . . . . . . . . . . . . . . . . . 14
Register descriptions . . . . . . . . . . . . . . . . . . . 16
Transmit Holding Register (THR) and
Receive Holding Register (RHR) . . . . . . . . . . 17
7.2
Interrupt Enable Register (IER) . . . . . . . . . . . 17
7.2.1
IER versus receive FIFO interrupt mode
operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.2.2
IER versus receive/transmit FIFO polled
mode operation. . . . . . . . . . . . . . . . . . . . . . . . 18
7.3
FIFO Control Register (FCR) . . . . . . . . . . . . . 19
7.3.1
DMA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.3.1.1
Mode 0 (FCR bit 3 = 0) . . . . . . . . . . . . . . . . . . 19
7.3.1.2
Mode 1 (FCR bit 3 = 1) . . . . . . . . . . . . . . . . . . 19
7.3.2
FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.4
Interrupt Status Register (ISR) . . . . . . . . . . . . 21
7.5
Line Control Register (LCR) . . . . . . . . . . . . . . 22
7.6
Modem Control Register (MCR) . . . . . . . . . . . 23
7.7
Line Status Register (LSR) . . . . . . . . . . . . . . . 25
7.8
Modem Status Register (MSR). . . . . . . . . . . . 26
7.9
Scratchpad Register (SPR) . . . . . . . . . . . . . . 27
7.10
Enhanced Feature Register (EFR) . . . . . . . . . 27
7.11
SC16C650B external reset conditions . . . . . . 28
8
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 29
9
Static characteristics. . . . . . . . . . . . . . . . . . . . 29
10
Dynamic characteristics . . . . . . . . . . . . . . . . . 30
10.1
Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . 32
11
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 39
12
Soldering of SMD packages . . . . . . . . . . . . . . 42
12.1
Introduction to soldering . . . . . . . . . . . . . . . . . 42
12.2
12.3
12.4
13
14
15
15.1
15.2
15.3
15.4
16
17
Wave and reflow soldering . . . . . . . . . . . . . . .
Wave soldering. . . . . . . . . . . . . . . . . . . . . . . .
Reflow soldering. . . . . . . . . . . . . . . . . . . . . . .
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . .
Revision history . . . . . . . . . . . . . . . . . . . . . . .
Legal information . . . . . . . . . . . . . . . . . . . . . .
Data sheet status . . . . . . . . . . . . . . . . . . . . . .
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . .
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . .
Contact information . . . . . . . . . . . . . . . . . . . .
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42
42
43
44
44
47
47
47
47
47
47
48
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2009.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 14 September 2009
Document identifier: SC16C650B_4
Similar pages