Marine VHF Audio and Signalling Processor
CMX885
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.
8.1.1 Reset Operations
A reset is automatically performed when power is applied to the CMX885. A reset can be issued as a
C-BUS command, either as a General Reset command ($01), or by setting the appropriate bit (b5) in the
Powerdown Control register ($C0). In the latter case, an option exists to protect the values held in the
Program Block (which is accessed via the Programming register, $C8). The action of each reset type is
shown in the table below:
Table 4 Reset Operations
Protect Bit
($C0 b4) State Block State
Program
Reset Type
1 Power on
cleared by h/w default
General Reset
(C-BUS $01)
2
cleared by h/w default
Reset
(C-BUS $C0 b5)
Reset
(C-BUS $C0 b5)
3
0
1
default
4
protected
8.1.2 General Reset – $01 write
The General Reset command has no data attached to it. It sets all operational C-BUS registers to $0000,
(apart from the registers marked as reserved ). Note that some transient data may appear in the following
registers during the reset and power-up processes – this should be ignored:
Aux ADC 1 Data
NWR Status and Data
Status
$A9
$BB
$C6
Aux ADC 2 Data
Rx Data 1
Tone Status / Ident
$AA
$C5
$CC
© 2010 CML Microsystems Plc
35
D/885/3
CMLMICRO [ CML MICROCIRCUITS ]
