XR17V258
修订版1.0.1
电源管理支持66MHZ PCI总线八进制UART
BIT FORMAT...................................................................................................................................................三十
T
ABLE
11: T
RANSMIT和
R
ECEIVE
D
ATA
R
EGISTER IN
B
YTE格式
, 16C550
兼容
.......................................................... 31
4 UART...................................................................................................................................................... 31
与分数除4.1可编程的波特率发生器.......................................... 31
F
IGURE
11. B
AUD
R
吃
G
enerator
............................................................................................................................................. 32
T
ABLE
12: T
与一位YPICAL的数据传输速率
24 MH
晶振或外部时钟AT
16X S
AMPLING
................................................. 32
4.2自动硬件（ RTS / CTS或DTR / DSR ）流控制操作................................. 33
F
IGURE
12. A
反对派
RTS / DTR
和
CTS / DSR F
低
C
ONTROL
O
PERATION
...................................................................................... 34
4.3红外模式............................................................................................................................................. 34
F
IGURE
13. I
NFRARED
T
RANSMIT
D
ATA
E
NCODING和
R
ECEIVE
D
ATA
D
ECODING
.......................................................................... 35
4.4内部LOOPBACK.................................................................................................................................... 35
F
IGURE
14. I
NTERNAL
L
OOP
B
确认
................................................................................................................................................. 36
4.5 UART通道配置寄存器和地址译码.......................................... 36
T
ABLE
13 ： UART通道配置寄存器。 .................................................. ................................................ 37
T
ABLE
14 ： UART通道配置寄存器的描述。 S
HADED位被启用
EFR B
IT
-4. ....... 38
4.6 TRANSMITTER.................................................................................................................................................. 39
4.6.1发送保持寄存器(THR).....................................................................................................................
4.6.2发送器操作非FIFO模式........................................ .................................................. ..........
F
IGURE
15. T
变送器
O
PERATION在非
-FIFO M
ODE
............................................................................................................
4.6.3发送器操作在FIFO模式.............................................................................................................
4.6.4自动RS485操作..........................................................................................................................................
F
IGURE
16. T
变送器
O
PERATION IN
FIFO
和
F
低
C
ONTROL
M
ODE
...................................................................................
4.7.1接收器操作非FIFO模式..........................................................................................................
F
IGURE
17. R
ECEIVER
O
PERATION在非
-FIFO M
ODE
..................................................................................................................
4.7.2接收机操作FIFO...........................................................................................................................
F
IGURE
18. R
ECEIVER
O
PERATION IN
FIFO
和
F
低
C
ONTROL
M
ODE
.........................................................................................
39
39
40
40
40
40
41
41
41
41
4.7接收器......................................................................................................................................................... 41
5.0 UART配置寄存器.............................................. .................................................. 42
5.1接收保存寄存器（ RHR ） - 只读........................................ ...........................................
5.2发送保持寄存器（ THR ） - 只写........................................ .......................................
5.3波特率发生器除数（ DLM ， DLL和DLD ） ...................................... .................................
5.4中断使能寄存器（ IER ） - READ / WRITE ....................................... .........................................
42
42
42
42
5.4.1 IER VERSUS接收FIFO中断模式运行........................................ ....................................... 42
5.4.2 IER VERSUS接收/发送FIFO查询模式操作...................................... ............................ 42
5.5中断状态寄存器（ ISR ） - 只读........................................ .......................................... 43
5.5.1中断的产生： ........................................................................................................................................ 44
5.5.2中断的清除： ............................................................................................................................................. 44
T
ABLE
15: I
NTERRUPT
S
环境允许和
P
RIORITY
L
伊维尔基尼
..................................................................................................................... 44
5.6 FIFO控制寄存器（ FCR ） - 只写........................................ ................................................. 45
T
ABLE
16: T
RANSMIT和
R
ECEIVE
FIFO牛逼
索具
T
能够并
L
伊维尔基尼
S
选举
.......................................................................... 46
5.7线控制寄存器（ LCR ） - 读/写....................................... ................................................. 46
T
ABLE
17: P
元数
P
AGC软件
................................................................................................................................................. 47
5.8调制解调器控制寄存器（ MCR ） - READ / WRITE ....................................... ...........................................
5.9线状态寄存器（ LSR ） - 只读........................................ .................................................. ....
5.10 MODEM状态寄存器（ MSR ） - 只读........................................ .............................................
5.11 MODEM状态寄存器（ MSR ） - 只写........................................ ............................................
48
49
50
51
T
ABLE
18: A
反对派
RS485
ALF
-
复式
D
IRECTION
C
ONTROL
D
ELAY FROM
T
RANSMIT
-
TO
-R
ECEIVE
................................................. 51
5.12便笺寄存器（ SPR ） - 读/写....................................... ................................................ 52
5.13功能控制寄存器（ FCTR ） - 读/写....................................... .................................... 52
T
ABLE
19: 16 S
选举中获胜
H
YSTERESIS
L
EVELS
W
HEN
T
索具
T
ABLE
-D
IS
S
选出
................................................................ 53
5.14增强功能寄存器（ EFR ） - 读/写....................................... .................................... 53
T
ABLE
20: S
OFTWARE
F
低
C
ONTROL
F
受膏
........................................................................................................................ 55
5.15 TXCNT [ 7 ： 0 ] ：发送FIFO水平计数器 - 只读................................... .............................
5.16 TXTRG [ 7 ： 0 ] ：发送FIFO触发电平 - 只写................................... ............................
5.17 RXCNT [ 7 ： 0 ] ：接收FIFO水平计数器 - 只读................................... ................................
5.18 RXTRG [ 7 ： 0 ] ：接收FIFO触发电平 - 只写................................... ...............................
5.19 XOFF1 ， XOFF2 ， XON1和XON2寄存器只写...................................... .............................
5.20 XCHAR寄存器，只读..................................................................................................................
55
55
55
55
55
56
T
ABLE
21 ： UART复位条件...................................................................................................................................... 57
绝对最大额定值............................................... .................................. 58
电气特性................................................ ............................... 58
DC电气特性
为
3.3V
信令
................................................................. 58
II
