ST16C1450CJ28 EXAR [Exar Corporation], ST16C1450CJ28 Datasheet - Page 9

• Manufacturer Part Number: ST16C1450CJ28
• Description: 2.97V TO 5.5V UART
• Manufacturer: EXAR [Exar Corporation]

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REV. 4.2.0
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).
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.
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.
2.4
2.4.1
2.4.2
O
UTPUT
153.6k
230.4k
460.8k
921.6k
Transmitter
19.2k
38.4k
76.8k
2400
4800
9600
400
Data Rate
Transmit Holding Register (THR) - Write Only
Transmitter Operation
T
ABLE
1: T
Clock (Decimal)
D
YPICAL DATA RATES WITH A
IVISOR FOR
2304
384
192
96
48
24
12
6
4
2
1
16x
D
IVISOR FOR
Clock (HEX)
180
900
C0
0C
60
30
18
06
04
02
01
14.7456 MH
9
16x
DLM P
V
Z CRYSTAL OR EXTERNAL CLOCK
ALUE
09
01
00
00
00
00
00
00
00
00
00
ROGRAM
(HEX)
DLL P
V
ALUE
C0
0C
00
80
60
30
18
06
04
02
01
ROGRAM
(HEX)
2.97V TO 5.5V UART
ST16C1450/51
D
E
ATA
RROR
0
0
0
0
0
0
0
0
0
0
0
R
ATE
(%)