Digi NS9215 User Manual
S E R I A L C O N T R O L M O D U L E : H D L C
HDLC Clock Divider Low
430
Hardware Reference NS9215
Register
Register bit
assignment
assignment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H D L C C l o c k D i v i d e r L o w
Address: 9002_9118
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved
I
MODE
Reserved
H
MODE
ECLK Not used
CMODE
U
MODE
Bits
Access
Mnemonic
Reset
Description
D31:08
R
Not used
0
Write this field to 0.
D07:05
R/W
CMODE
0
Coding mode
000
000
NRZ data encoding for receiver and transmitter
010
RZI data encoding for receiver and transmitter
100
Biphase-Level (Manchester) data encoding for
receiver and transmitter
receiver and transmitter
110
Biphase-Space data encoding for receiver and
transmitter
transmitter
111
Biphase-Mark data encoding for receiver and
transmitter
transmitter
D04
R/W
HMODE
0
HDLC mode
0
Normal HDLC data encoding
1
Enable NRZI coding (1/4 bit-cell IRDA-compliant).
This mode can be used only with internal clock and
NRZ data encoding.
This mode can be used only with internal clock and
NRZ data encoding.
D03
R/W
IMODE
0
Transmit idle mode
0
0
Transmit flags while in idle mode
1
Transmit all 1s while in idle mode
D02
R/W
UMODE
0
Underrun mode
0
0
Transmit flag on underrun
1
Transmit abort on underrun
D01
R/W
ECLK
0
External clock mode
0
0
The HDLC module will use separate external receive
and transmit clocks
and transmit clocks
1
The HDLC receiver and transmitter will both use the
external transmit clock.
external transmit clock.
D00
R
Not used
0
Always write 0 to this bit.