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ST16C1550IP28 Fiches technique(PDF) 10 Page - Exar Corporation

No de pièce ST16C1550IP28
Description  2.97V TO 5.5V UART WITH 16-BYTE FIFO
Download  37 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C1550IP28 Fiches technique(HTML) 10 Page - Exar Corporation

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ST16C1550/51
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2.97V TO 5.5V UART WITH 16-BYTE FIFO
REV. 4.2.0
10
2.5
Transmitter
The transmitter section comprises of an 8-bit Transmit Shift Register (TSR) and 16 bytes of FIFO which
includes a byte-wide Transmit Holding Register (THR). TSR shifts out every data bit with the 16X internal
clock. A bit time is 16 clock periods. The transmitter sends the start-bit followed by the number of data bits,
inserts the proper parity-bit if enabled, and adds the stop-bit(s). The status of the FIFO and TSR are reported in
the Line Status Register (LSR bit-5 and bit-6).
2.5.1
Transmit Holding Register (THR) - Write Only
The transmit holding register is an 8-bit register providing a data interface to the host processor. The host
writes transmit data byte to the THR to be converted into a serial data stream including start-bit, data bits,
parity-bit and stop-bit(s). The least-significant-bit (Bit-0) becomes first data bit to go out. The THR is the input
register to the transmit FIFO of 16 bytes when FIFO operation is enabled by FCR bit-0. Every time a write
operation is made to the THR, the FIFO data pointer is automatically bumped to the next sequential data
location.
2.5.2
Transmitter Operation in non-FIFO Mode
The host loads transmit data to THR one character at a time. The THR empty flag (LSR bit-5) is set when the
data byte is transferred to TSR. THR flag can generate a transmit empty interrupt (ISR bit-1) when it is enabled
by IER bit-1. The TSR flag (LSR bit-6) is set when TSR becomes completely empty.
TABLE 2: TYPICAL DATA RATES WITH A 14.7456 MHZ CRYSTAL OR EXTERNAL CLOCK
OUTPUT Data Rate
MCR Bit-7=1
OUTPUT Data Rate
MCR Bit-7=0
DIVISOR FOR 16x
Clock (Decimal)
DIVISOR FOR 16x
Clock (HEX)
DLM
PROGRAM
VALUE (HEX)
DLL
PROGRAM
VALUE (HEX)
DATA RATE
ERROR (%)
100
400
2304
900
09
00
0
600
2400
384
180
01
80
0
1200
4800
192
C0
00
C0
0
2400
9600
96
60
00
60
0
4800
19.2k
48
30
00
30
0
9600
38.4k
24
18
00
18
0
19.2k
76.8k
12
0C
00
0C
0
38.4k
153.6k
6
06
00
06
0
57.6k
230.4k
4
04
00
04
0
115.2k
460.8k
2
02
00
02
0
230.4k
921.6k
1
01
00
01
0


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