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MODE CONTROL REGISTERS (PCM1780/82)

User-Programmable Mode Controls

Register Map

PCM1780, PCM1781, PCM1782

SLES132A – MARCH 2005 – REVISED APRIL 2005

The PCM1780/82 includes a number of user-programmable functions, which are accessed via control registers.

The registers are programmed using the serial control interface, which was previously discussed in the Software

Control section of this data sheet. Table 5 lists the available mode control functions, along with their reset default

conditions and associated register index.

The mode control register map is shown in Table 6. Each register includes an index (or address) indicated by the

IDX[6:0] bits.

Table 5. User-Programmable Mode Controls

FUNCTION

RESET DEFAULT

REGISTER

BIT(S)

Digital attenuation control, 0 dB to –63 dB in 0.5-dB

0 dB, no attenuation

16 and 17

AT1[7:0], AT2[7:0]

steps

Soft mute control

Mute disabled

18

MUT[2:0]

Oversampling rate control

×64, ×32, ×16

18

OVER

Soft reset control

Reset disabled

18

SRST

DAC operation control

DAC1 and DAC2 enabled

19

DAC[2:1]

De-emphasis function control

De-emphasis disabled

19

DM12

De-emphasis sample rate selection

44.1 kHz

19

DMF[1:0]

Audio data format control

24-bit, left-justified

20

FMT[2:0]

Digital filter rolloff control

Sharp rolloff

20

FLT

Digital attenuation mode select

0 to –63 dB, 0.5 dB/step

21

DAMS

Output phase select

Normal Phase

22

DREV

Zero-flag polarity select

High

22

ZREV

Zero-flag function select

L-, R-channels independent

22

AZRO

Table 6. Mode Control Register Map

IDX

REGIS-

B15

B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

(B8–B14)

TER

10h

16

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

AT17

AT16

AT15

AT14

AT13

AT12

AT11

AT10

11h

17

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

AT27

AT26

AT25

AT24

AT23

AT22

AT21

AT20

12h

18

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 SRST OVER

RSV

RSV

RSV

RSV

MUT2

MUT1

13h

19

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

RSV

DMF1 DMF0 DM12

RSV

RSV

DAC2

DAC1

14h

20

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

RSV

RSV

FLT

RSV

RSV

FMT2

FMT1

FMT0

15h

21

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

RSV

RSV

RSV

RSV

RSV

RSV

RSV

DAMS

16h

22

0

IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0

RSV

RSV

RSV

RSV

0

AZRO ZREV

DREV

19