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REV 。 4.2.1
ST16C1450/51
2.97V TO 5.5VUART
目录
一般DESCRIPTION................................................................................................. 1
F
EATURES
..................................................................................................................................................... 1
A
PPLICATIONS
............................................................................................................................................... 1
F
IGURE
1. B
LOCK
D
IAGRAM
............................................................................................................................................................. 1
F
IGURE
2. ST16C1450 P
INOUTS
..................................................................................................................................................... 2
订购信息
................................................................................................................................ 2
引脚说明......................................................................................................... 3
数据总线接口............................................................................................................................................. 3
调制解调器或串行I / O接口....................................................................................................................... 3
1.0产品说明.................................................................................................................... 4
的附属信号， ................................................................................................................................................ 4
2.0功能说明............................................................................................................五
2.1内部寄存器...................................................................................................................................五
2.2晶体振荡器或外部时钟............................................ ............................................. 5
F
IGURE
3. T
YPICAL振荡器连接
................................................................................................................................. 5
2.3可编程的波特率发生器............................................. ................................................ 5
T
ABLE
1: T
与一位YPICAL的数据传输速率
14.7456 MH
晶振或外部时钟
........................................................................ 6
2.4发送器................................................................................................................................................. 6
2.4.1发送保持寄存器（ THR ） - 只写...................................... .................................................. 6 ...
2.4.2变送器OPERATION....................................................................................................................................... 6
F
IGURE
4. T
变送器
O
PERATION
............................................................................................................................................... 7
2.5接收器........................................................................................................................................................ 7
2.5.1接收保持寄存器（ RHR ） - 只读..................................... .................................................. 7 .......
F
IGURE
5. R
ECEIVER
O
PERATION在非
-FIFO M
ODE
...................................................................................................................... 8
2.6特殊（增强功能）模式..................................................................................................... 8
2.6.1软复位................................................................................................................................................................ 8
2.6.2掉电模式................................................................................................................................................. 8
2.7
内部环回.................................................................................................................................. 8
F
IGURE
6. I
NTERNAL
L
OOPBACK
....................................................................................................................................................... 9
3.0 UART内部寄存器........................................................................................................... 10
T
ABLE
2 ： ST16C1450内部UART REGISTERS................................................................................................................ 10
T
ABLE
3 ：内部寄存器描述。 S
HADED位被使能时
EFR B
IT
-4=1......................................... 11
4.0内部寄存器说明.............................................. .............................................. 12
4.1
4.2
4.3
4.4
接收保持寄存器（ RHR ） - 只读........................................ .......................................
发送保持寄存器（ THR ） - 只写........................................ ....................................
中断使能寄存器（ IER ） - 读/写........................................ .....................................
中断状态寄存器（ ISR ） - 只读........................................ .......................................
12
12
12
12
4.4.1中断的产生： ...................................................................................................................................... 13
4.4.2中断的清除： ........................................................................................................................................... 13
T
ABLE
4: I
NTERRUPT
S
环境允许和
P
RIORITY
L
伊维尔基尼
....................................................................................................................... 13
4.5线控制寄存器（ LCR ） - 读/写....................................... .............................................. 13
T
ABLE
5: P
元数选择
.......................................................................................................................................................... 14
4.6
4.7
4.8
4.9
调制解调器控制寄存器（ MCR ）或通用输出控制 - 读/写
线路状态寄存器（ LSR ） - 只读......................................... ..................................................
MODEM状态寄存器（ MSR ） - 只读......................................... ...........................................
便笺寄存器（ SPR ） - READ / WRITE ........................................ ..............................................
15
16
16
17
T
ABLE
6 ： UART复位CONDITIONS........................................................................................................................................ 18
绝对最大额定值............................................... ................................... 19
T
YPICAL封装热阻数据
(
误差幅度
: ± 15%) ................................................. 19
电气特性................................................ ................................ 19
DC ê
LECTRICAL
C
极特
.............................................................................................................. 19
AC ê
LECTRICAL
C
极特
.............................................................................................................. 20
TA=0
o要
70
O
C (-40
o要
+85
O
C
对于工业等级包装
), V
CC是
2.97V
TO
5.5V...................... 20
F
IGURE
7. C
LOCK
T
即时通信
............................................................................................................................................................... 21
F
IGURE
8. M
ODEM
I
NPUT
/O
安输出
T
即时通信
...................................................................................................................................... 21
F
IGURE
9. D
ATA
B
US
R
EAD
T
即时通信
................................................................................................................................................ 22
F
IGURE
10. D
ATA
B
US
W
RITE
T
即时通信
............................................................................................................................................ 22
F
IGURE
11. R
ECEIVE
R
EADY
＆放大器;我
NTERRUPT
T
即时通信
......................................................................................................................... 23
I
