參數(shù)資料
型號： ST16C552ACJ68TR-F
廠商： Exar Corporation
文件頁數(shù)： 14/39頁
文件大?。?/td> 0K
描述： IC UART FIFO 16B DUAL 68PLCC
標(biāo)準(zhǔn)包裝： 250
特點： *
通道數(shù)： 2，DUART
FIFO's： 16 字節(jié)
規(guī)程： 打印機
電源電壓： 2.97 V ~ 5.5 V
帶并行端口： 是
帶故障啟動位檢測功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 68-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 68-PLCC
包裝： 帶卷 (TR)
21
ST16C552/552A
Rev. 3.40
ISR BIT-0:
Logic 0 = An interrupt is pending and the ISR contents
may be used as a pointer to the appropriate interrupt
service routine.
Logic 1 = No interrupt pending. (normal default condi-
tion)
ISR BIT 1-3: (logic 0 or cleared is the default condition)
These bits indicate the source for a pending interrupt
at interrupt priority levels 1, 2, and 3 (See Interrupt
Source Table).
ISR BIT 4-5: (logic 0 or cleared is the default condition)
Not Used - initialized to a logic 0.
ISR BIT 6-7: (logic 0 or cleared is the default condition)
These bits are set to a logic 0 when the FIFO’s are not
being used in the 16C450 mode. They are set to a logic
1 when the FIFO’s are enabled in the 16C552/552A
mode.
Line Control Register (LCR)
The Line Control Register is used to specify the
asynchronous data communication format. The word
length, the number of stop bits, and the parity are
selected by writing the appropriate bits in this register.
LCR BIT 0-1: (logic 0 or cleared is the default condi-
tion)
These two bits specify the word length to be transmit-
ted or received.
BIT-1
BIT-0
Word length
0
5
0
1
6
1
0
7
1
8
LCR BIT-2: (logic 0 or cleared is the default condition)
The length of stop bit is specified by this bit in
conjunction with the programmed word length.
BIT-2
Word length
Stop bit
length
(Bit time(s))
0
5,6,7,8
1
5
1-1/2
1
6,7,8
2
LCR BIT-3:
Parity or no parity can be selected via this bit.
Logic 0 = No parity. (normal default condition)
Logic 1 = A parity bit is generated during the transmis-
sion, receiver checks the data and parity for transmis-
sion errors.
LCR BIT-4:
If the parity bit is enabled with LCR bit-3 set to a logic
1, LCR BIT-4 selects the even or odd parity format.
Logic 0 = ODD Parity is generated by forcing an odd
number of logic 1’s in the transmitted data. The
receiver must be programmed to check the same
format. (normal default condition)
Logic 1 = EVEN Parity is generated by forcing an even
the number of logic 1’s in the transmitted. The receiver
must be programmed to check the same format.
LCR BIT-5:
If the parity bit is enabled, LCR BIT-5 selects the
forced parity format.
LCR BIT-5 = logic 0, parity is not forced. (normal
default condition)
LCR BIT-5 = logic 1 and LCR BIT-4 = logic 0, parity bit
is forced to a logical 1 for the transmit and receive
data.
LCR BIT-5 = logic 1 and LCR BIT-4 = logic 1, parity bit
is forced to a logical 0 for the transmit and receive
data.
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