MAS 3507D
PRELIMINARY DATA SHEET
3.6. Register Table
3.6.1. DC/DC Converter
In Table 3–6, the internal registers that are useful for
controlling the MAS 3507D are listed. They are acces-
sible by ‘register read/write’ I2C commands (see Sec-
tion 3.3. on page 20).
The DCCF Register controls both the internal voltage
monitor and DC/DC converter. Between output voltage
of the DC/DC converter and the internal voltage moni-
tor threshold an offset exists which is shown in the fol-
lowing table. Please pay attention to the fact, that I2C
protocol is working only if the processor is active
(WSEN = 1). However, the setting for the DCCF regis-
ter will remain active if the DCEN and WSEN lines are
deasserted
Important note! Writing into undocumented registers
or read-only registers is always possible, but it is highly
recommended not to do so. It may damage the func-
tion of the firmware and may even lead to a complete
system crash of the decoder operation which can only
be restored by a reset.
Table 3–6: Command Register Table
Address
R/W
Name
Comment
Default
$8e
w
DCCF
Set DC/DC converter mode
$08000
(see Table 3–7 on page 27)
$aa
r/w
r
Mute / Bypass
Tone Control
Forces a mute of the digital output
bypass Bass / Treble / Volume matrix
$0
$ed1)
PIOData
Read back the PIO pin levels. The PI0 pin corresponds to bit
0 in the PIOData register.
This register can be used to detect the actual state of the
PIO pins, regardless of the PIO configuration.
$e6
$e7
$6b
$6f
r/w
r/w
r/w
r/w
StartupConfig
KPrescale
KBass
Shadows the start-up configuration set via PIO pins or I2C
command (valid are bits 8, 4...0 as described in Table 2–8.
responsible for prescale of the tone filter (prevent overflows) $80000
(see Section 3.6.3. on page 28)
responsible for increase / decrease of low frequencies
(see Section 3.6.3. on page 28)
$0
KTreble
responsible for increase / decrease of high frequencies
(see Section 3.6.3. on page 28)
$0
1) In order to get the right information of the PIO pin levels (except for PI19, Demand Pin), register $ed should be
read and evaluated. However, the Demand Pin PI19 is shadowed in bit 19 of register $c8.
26
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