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ST16C1450IQ48 Fiches technique(PDF) 9 Page - Exar Corporation

No de pièce ST16C1450IQ48
Description  2.97V TO 5.5V UART
Download  32 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

ST16C1450IQ48 Fiches technique(HTML) 9 Page - Exar Corporation

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ST16C1450/51
REV. 4.2.0
2.97V TO 5.5V UART
9
2.4
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).
2.4.1
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.
2.4.2
Transmitter Operation
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 1: TYPICAL DATA RATES WITH A 14.7456 MHZ CRYSTAL OR EXTERNAL CLOCK
OUTPUT Data Rate
DIVISOR FOR 16x
Clock (Decimal)
DIVISOR FOR 16x
Clock (HEX)
DLM PROGRAM
VALUE (HEX)
DLL PROGRAM
VALUE (HEX)
DATA RATE
ERROR (%)
400
2304
900
09
00
0
2400
384
180
01
80
0
4800
192
C0
00
C0
0
9600
96
60
00
60
0
19.2k
48
30
00
30
0
38.4k
24
18
00
18
0
76.8k
12
0C
00
0C
0
153.6k
6
06
00
06
0
230.4k
4
04
00
04
0
460.8k
2
02
00
02
0
921.6k
1
01
00
01
0


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