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ST16C450CJ44 bảng dữ liệu(PDF) 8 Page - Exar Corporation

tên linh kiện ST16C450CJ44
Giải thích chi tiết về linh kiện  UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)
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ST16C450
8
Rev. 4.20
FUNCTIONAL DESCRIPTIONS
Internal Registers
The ST16C450 provides 11 internal registers for
monitoring and control. These registers are shown in
Table 2 below. These registers function as data holding
registers (THR/RHR), interrupt
status and control
registers (IER/ISR), line status and control registers,
(LCR/LSR), modem status and control registers (MCR/
MSR), programmable data rate (clock) control registers
(DLL/DLM), and a user assessable scratchpad register
(SPR).
Table 2, INTERNAL REGISTER DECODE
A2
A1
A0
READ MODE
WRITE MODE
General Register Set (THR/RHR, IER/ISR, MCR/MSR, LCR/LSR, SPR):
0
0
0
Receive Holding Register
Transmit Holding Register
0
0
1
Interrupt Enable Register
0
1
0
Interrupt Status Register
0
1
1
Line Control Register
1
0
0
Modem Control Register
1
0
1
Line Status Register
1
1
0
Modem Status Register
1
1
1
Scratchpad Register
Scratchpad Register
Baud Rate Register Set (DLL/DLM): Note *3
0
0
0
LSB of Divisor Latch
LSB of Divisor Latch
0
0
1
MSB of Divisor Latch
MSB of Divisor Latch
Note *3: These registers are accessible only when LCR bit-7 is set to a logic 1.


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