參數(shù)資料
型號(hào)： XR17C152CM-0A-EVB
廠商： Exar Corporation
文件頁(yè)數(shù)： 18/62頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR17C152 100TQFP
標(biāo)準(zhǔn)包裝： 1
系列： *
á
XR17C152
REV. 1.2.0
5V PCI BUS DUAL UART
25
clock at 16X clock rate. At 8X sampling rate, these data rates would double. When using a non-standard data
rate crystal or external clock, the divisor value can be calculated with the following equation(s).
4.2
Transmitter
The transmitter section comprises of 64 bytes of FIFO, a byte-wide Transmit Holding Register (THR) and an 8-
bit Transmit Shift Register (TSR). THR receives a data byte from the host (non-FIFO mode) or a data byte from
the FIFO when the FIFO is enabled by FCR bit-0. TSR shifts out every data bit with the 16X or 8X internal
clock. A bit time is 16 or 8 clock periods. The transmitter sends the start bit followed by the number of data bits,
inserts the proper parity bit if enable, and adds the stop bit(s). The status of the THR and TSR are reported in
the Line Status Register (LSR bit-5 and bit-6).
4.2.1
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 also the
input register to the transmit FIFO of 64 bytes when FIFO operation is enabled by FCR bit-0. A THR empty
interrupt can be generated when it is enabled in IER bit-1.
4.2.2
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.
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16), WITH 8XMODE [1:0] IS 0
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 8), WITH 8XMODE [1:0] IS 1
TABLE 9: TYPICAL DATA RATES WITH A 14.7456 MHZ CRYSTAL OR EXTERNAL CLOCK AT 16X SAMPLING
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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XR17C152IM 制造商:EXAR 制造商全稱:EXAR 功能描述:5V PCI BUS DUAL UART
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