ST16C454 데이터 시트보기 (PDF) - Exar Corporation
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ST16C454 Datasheet PDF : 29 Pages
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ST16C454
Internal Registers
The 454 provides 12 internal registers for monitoring and
control. These resisters are shown in Table 4 below.
These registers are similar to those already available in
the standard 16C450. These registers function as data
holding registers (THR/RHR), interrupt status and con-
trol 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). Register functions are more fully described in
the following paragraphs.
Table 4, 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
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Receive Holding Register
Interrupt Status Register
Line Status Register
Modem Status Register
Scratchpad Register
Transmit Holding Register
Interrupt Enable Register
Line Control Register
Modem Control Register
Scratchpad Register
Baud Rate Register Set (DLL/DLM): Note *2
0
0
0
0
0
1
LSB of Divisor Latch
MSB of Divisor Latch
LSB of Divisor Latch
MSB of Divisor Latch
Note *2: These registers are accessible only when LCR bit-7 is set to a logic 1.
Rev. 3.31
10
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