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参数资料
型号： SCC2681AE1A44,518
厂商： NXP Semiconductors
文件页数： 4/29页
文件大小： 0K
描述： IC DUART SOT187-2
标准包装： 500
特点： 故障启动位检测
通道数： 2，DUART
FIFO's： 3 位
电源电压： 5V
带并行端口： 是
带自动流量控制功能： 是
带故障启动位检测功能： 是
带CMOS： 是
安装类型： 表面贴装
封装/外壳： 44-LCC（J 形引线）
供应商设备封装： 44-PLCC
包装： 带卷 (TR)
其它名称： 935274518518
SCC2681AE1A44-T
SCC2681AE1A44-T-ND
Philips Semiconductors
Product data
SCC2681
Dual asynchronous receiver/transmitter (DUART)
2004 Apr 06
12
Table 2.
Register Bit Formats
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
MR1A
RxRTS
CONTROL
RxINT
SELECT
ERROR
MODE*
PARITY MODE
PARITY
TYPE
BITS PER
CHARACTER
MR1A
MR1B
0 = No
1 = Yes
0 = RxRDY
1 = FFULL
0 = Char
1 = Block
00 = With Parity
01 = Force Parity
10 = No Parity
11 = Multidrop Mode**
0 = Even
1 = Odd
00 = 5
01 = 6
10 = 7
11 = 8
NOTE:
* In block error mode, block error conditions must be cleared by using the error reset command (command 4x) or a receiver reset.
** Please see Receiver Reset note on page 21.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
MR2A
CHANNEL MODE
TxRTS
CONTROL
CTS
ENABLE Tx
STOP BIT LENGTH*
MR2A
MR2B
00 = Normal
01 = Auto-Echo
10 = Local loop
11 = Remote loop
0 = No
1 = Yes
0 = No
1 = Yes
0 = 0.563
4 = 0.813
8 = 1.563
C = 1.813
1 = 0.625
5 = 0.875
9 = 1.625
D = 1.875
2 = 0.688
6 = 0.938
A = 1.688
E = 1.938
3 = 0.750
7 = 1.000
B = 1.750
F = 2.000
NOTE:
*Add 0.5 to values shown for 0 – 7 if channel is programmed for 5 bits/char.
CSRA
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
CSRA
CSRB
RECEIVER CLOCK SELECT
TRANSMITTER CLOCK SELECT
CSRB
See Text
NOTE:
* See Table 5 for BRG Test frequencies in this data sheet, and
“Extended baud rates for SCN2681, SCN68681, SCC2691, SCC2692,
SCC68692 and SCC2698B” in application notes elsewhere in this publication.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
CRA
CRB
MISCELLANEOUS COMMANDS
DISABLE Tx
ENABLE Tx
DISABLE Rx
ENABLE Rx
CRB
Not used –
must be 0
See Text
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
NOTE:
*Access to the upper three bits of the command register should be separated by three (3) edges of the X1 clock. A disabled transmitter cannot
be loaded.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
SRA
SRB
RECEIVED
BREAK*
FRAMING
ERROR*
PARITY
ERROR*
OVERRUN
ERROR
TxEMT
TxRDY
FFULL
RxRDY
SRB
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
NOTE:
* These status bits are appended to the corresponding data character in the receive FIFO. A read of the status provides these bits (7:5) from
the top of the FIFO together with bits (4:0). These bits are cleared by a “reset error status” command. In character mode they are discarded
when the corresponding data character is read from the FIFO. In block error mode, block error conditions must be cleared by using the error
reset command (command 4x) or a receiver reset.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
OP7
OP6
OP5
OP4
OP3
OP2
OPCR
0 = OPR[7]
1 = TxRDYB
0 = OPR[6]
1 = TxRDYA
0 = OPR[5]
1 = RxRDY/
FFULLB
0 = OPR[4]
1 = RxRDY/
FFULLA
00 = OPR[3]
01 = C/T OUTPUT
10 = TxCB(1x)
11 = RxCB(1x)
00 = OPR[2]
01 = TxCA(16x)
10 = TxCA(1x)
11 = RxCA(1x)
OPR
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
OPR bit
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
OP pin
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
NOTE:
The level at the OP pin is the inverse of the bit in the OPR register.
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