參數(shù)資料
型號: ST16C452PS
廠商: Exar Corporation
英文描述: Dual UART with Parallel Printer Port(雙通用異步接收器/發(fā)送器(帶并行打印機(jī)端口))
中文描述: 雙UART與并行打印機(jī)端口(雙通用異步接收器/發(fā)送器(帶并行打印機(jī)端口))
文件頁數(shù): 11/30頁
文件大?。?/td> 389K
代理商: ST16C452PS
11
ST16C452/452PS
Rev. 3.10
available at the user data interface, D0-D7. The user
optionally compares the received data to the initial
transmitted data for verifying error free operation of
the UART TX/RX circuits.
In this mode, the receiver and transmitter interrupts
are fully operational. The Modem Control Interrupts
are also operational. However, the interrupts can only
be read using lower four bits of the Modem Control
Register (MCR bits 0-3) instead of the four Modem
Status Register bits 4-7. The interrupts are still con-
trolled by the IER.
Figure 6, INTERNAL LOOP-BACK MODE DIAGRAM
D0-D7
-IOR
-IOW
-RESET
BIDEN
A0-A2
-CSA
-CSB
-CSP
INT A,B
INTP
TX A,B
RX A,B
D
&
C
R
S
L
I
C
L
Transmit
Holding
Registers
Transmit
Shift
Register
Receive
Holding
Registers
Receive
Shift
Register
I
&
C
Clock
&
Baud Rate
Generator
C
Printer
Data
Ports
PD0-PD7
Printer
Control
Logic
-STROBE
INIT
-AUTOFDX
-SELCTIN
PE, SELECT
-BUSY, -ACK
ERROR
-RTS
M
-CTS
-DTR
-DSR
-RI
-CD
(-OP1)
(-OP2)
M
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