ST16C452CJ68PS-F View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'ST16C452CJ68PS-F' PDF : 30 Pages View PDF
ST16C452/452PS
REGISTER FUNCTIONAL DESCRIPTIONS
The following table delineates the assigned bit functions for the eighteen 452/452PS internal registers. The
assigned bit functions are more fully defined in the following paragraphs.
Table 7, ST16C452/452PS INTERNAL REGISTERS
A2 A1 A0
Register
[Default]
Note 5*
BIT-7
BIT-6
General Register Set: Note 1*
000
RHR [XX]
bit-7
bit-6
000
THR [XX]
bit-7
bit-6
001
IER [00]
0
0
010
ISR [01]
0
0
011
100
LCR [00]
MCR [00]
divisor
latch
enable
0
set
break
0
BIT-5
bit-5
bit-5
0
0
set
parity
0
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
bit-4
bit-4
0
0
even
parity
loop
back
bit-3
bit-3
Modem
Status
Interrupt
INT
priority
bit-2
parity
enable
INT A/B
enable
bit-2
bit-2
Receive
Line
Status
interrupt
INT
priority
bit-1
stop
bits
[X]
bit-1
bit-1
Transmit
Holding
Register
interrupt
INT
priority
bit-0
word
length
bit-1
-RTS
bit-0
bit-0
Receive
Holding
Register
INT
status
word
length
bit-0
-DTR
101
LSR [60]
1 1 0 MSR [X0]
0
THR &
TSR
empty
CD
RI
111
SPR [FF]
bit-7
bit-6
Special Register Set: Note *2
000
DLL [XX]
bit-7
bit-6
001
DLM [XX]
bit-15
bit-14
THR.
empty
break
interrupt
framing
error
DSR
bit-5
CTS
bit-4
delta
-CD
bit-3
bit-5
bit-13
bit-4
bit-12
bit-3
bit-11
parity
error
delta
-RI
bit-2
bit-2
bit-10
overrun
error
delta
-DSR
bit-1
receive
data
ready
delta
-CTS
bit-0
bit-1
bit-0
bit-9
bit-8
Rev. 3.20
13
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