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VS1103b Datasheet

FUNCTIONAL DESCRIPTION

6.6.4

SCI_CLOCKF (RW)

SCI_CLOCKF is used to control the internal clock of VS1103b.

SCI_CLOCKF bits

Name

Bits

Description

SC_MULT

15:13

Clock multiplier

SC_ZERO

12:11

Set to zero

SC_FREQ

10: 0

Clock frequency

SC_MULT activates the built-in clock multiplier. This will multiply XTALI to create a higher CLKI.

The values are as follows:

SC_MULT

MASK

CLKI

0x0000

XTALI

0x2000

XTALI×1.5

0x4000

XTALI×2.0

0x6000

XTALI×2.5

0x8000

XTALI×3.0

0xa000

XTALI×3.5

0xc000

XTALI×4.0

0xe000

XTALI×4.5

SC_FREQ is used to tell if the input clock XTALI is running at something else than 12.288 MHz.

XTALI is set in 4 kHz steps. The formula for calculating the correct value for this register is

XT ALI−8000000

4000

(XTALI is in Hz).

Note: As opposed to some other VS10XX chips, a software reset must be performed after

SCI_CLOCKF has been set. It is recommended that SCI_CLOCKF is set only after each

hardware reset / startup.

Note: The default value 0 is assumed to mean XTALI=12.288 MHz.

Note: Because maximum sample rate is

XT ALI

256

, all sample rates are not available if XTALI

< 12.288

MHz.

Example: If SCI_CLOCKF is 0xC3E8, SC_MULT = 6 and SC_FREQ = 0x3E8 = 1000. This

means that XTALI = 1000 × 4000 + 8000000 = 12 MHz. The clock multiplier is set to 4.0×XTALI =

MHz.

6.6.5

SCI_DECODE_TIME (RW)

When decoding correct MIDI data, current decoded time is shown in this register in full seconds.

The user may change the value of this register. In that case the new value should be written

twice.

SCI_DECODE_TIME is reset at every software reset and also when MIDI decoding starts or

ends.

Version: 1.04, 2018-03-16

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