AX.25 Modem
CMX7031/CMX7041
7.13 C-BUS Register Summary
Table 8 C-BUS Registers
ADDR.
(hex)
$01
Word Size
REGISTER
(bits)
0
W
C-BUS RESET
$A7
$A8
$A9
$AA
$AB
$AC
$AD
$AE
$AF
W
W
R
GPIO Control - $A7 16-bit write
16
16
16
16
16
16
16
16
AuxDAC Control - $A8 16-bit write
AuxADC1 Data - $A9 16-bit read/Checksum 2 hi
AuxADC2 Data - $AA 16-bit read/Checksum 2 lo
SYSCLK1 PLL Data
SYSCLK1 Ref
SYSCLK2 PLL Data
R
W
W
W
W
SYSCLK2 Ref
reserved
$B0
$B1
$B2
$B3
$B4
$B5
$B6
$B7
$B8
reserved
Input Gain and Routing - $B1 write
RF Channel Data
RF Channel Control
RF Channel Status
TxData Count - $B5 write
TxData Write Block - $B6, $B7, $CA, $CB write
TxData Write Block - $B6, $B7, $CA, $CB write
RxData Read Block - $B8, $B9, $BA, $BB
read/Checksum 1 hi
W
W
W
R
W
W
W
R
16
16
16
8
16
16
16
16
$B9
R
RxData Read Block - $B8, $B9, $BA, $BB
read/Checksum 1 lo
16
$BA
$BB
$BC
$BD
$BE
$BF
R
R
RxData Read Block - $B8, $B9, $BA, $BB read
RxData Read Block - $B8, $B9, $BA, $BB read
reserved
reserved
reserved
16
16
reserved
$C0
$C1
$C2
$C3
$C4
$C5
$C6
$C7
$C8
$C9
$CA
$CB
$CC
$CD
$CE
$CF
W
W
W
W
Power Down Control - $C0 write
Mode Control – $C1 write
Output Level – $C2 write
Clock Control - $C3 write
reserved
reserved
Status – $C6 read
reserved
Programming Register – $C8 write
reserved
TxData Write Block - $B6, $B7, $CA, $CB write
TxData Write Block - $B6, $B7, $CA, $CB write
Reserved - $CC read
reserved
Interrupt Mask - $CE write
reserved
16
16
16
16
R
16
16
W
W
W
R
16
16
16
W
16
All other C-BUS addresses (including those not listed above) are either reserved for future use or allocated
for production testing and must not be accessed in normal operation.
2013 CML Microsystems Plc
Page 35
D/7031/7041_FI-4.x/5
CMLMICRO [ CML MICROCIRCUITS ]
