Rev.1.00 2003.05.08

page 13 of 23

M65881AFP

SERIAL CONTROL

bit

Flag name

Functional Explanation

H

L

INIT

1

MODE1

Mode setting1

"L" fixed

–

2

MODE2

Mode setting2

"L" fixed

–

3

TEST1

Test Mode 1

"L" fixed

L

4

TEST2

Test Mode 2

"L" fixed

L

5

NSLMT1

Output Limit 1

L

6

NSLMT2

Output Limit 2

L

7

GCONT1

Channel selection for Gain Control Block 1

L/R Independence

L/R Common

L

8

GCONT2

Channel selection for Gain Control Block 2

Lch

Rch

L

9

active

non-active

L

10

active

non-active

L

11

–

12

GAIN0

Gain Data Index (MSB)

H

13

GAIN1

Gain Data Index

L

14

GAIN2

Gain Data Index

L

15

GAIN3

Gain Data Index

L

16

GAIN4

Gain Data Index (LSB)

L

17

GAIN5

Gain Data Mantissa (MSB)

H

18

GAIN6

Gain Data Mantissa

L

19

GAIN7

Gain Data Mantissa

L

20

GAIN8

Gain Data Mantissa

L

21

GAIN9

Gain Data Mantissa

L

22

GAIN10

Gain Data Mantissa

L

23

GAIN11

Gain Data Mantissa

L

24

GAIN12

Gain Data Mantissa (LSB)

L

Refer to Table 1-1.

1. Gain Control Mode

No setting bits means " Don't care".

•Output Limit (bit5,6: NSLMT1,2)

The M65881AFP has Over Flow Limit function which detects by input signal level and limit gain control.

The limit Value is set by Gain control Mode ( bit5,6 "NSLMT1, 2") and System2 Mode( bit17 "NSOBIT").

•Limit value setting of output for gain control and

∆Σ (bit5, 6 : NSLMT1, 2)

Table 1-1a Limit Value [ In case of 6bit mode, system2 mode bit 17( NSOBIT )="L".]

NSLMT1,2

(L, L)

Output Limit Value of gain

±0.9375

±0.90625

(L, H)

±0.875

(H, H)

±0.84375

61 values (±30)

63 values (±31)

59 values (±29)

57 values (±28)

Table 1-1b Limit Value [ In case of 5bit mode, system2 mode bit 17( NSOBIT )="H".]

NSLMT1,2

(L, L)

Output Limit Value of gain

±0.90625

PWM Output ( Limit Value from

∆Σ Block)

(H, L)

±0.875

(L, H)

±0.84375

(H, H)

±0.8125

31 value (±15)

31 value (±15)

29 value (±14)

29 value (±14)

•Channel selection for Gain Control Block (bit7,bit8: GCONT1, GCONT2)

These bit selection enable to control gain data "L/R common" or "L/R independence".

GCONT1:"L"… L/R common "H"...L/Rch independence.

GCONT2:"L"… Rch only

"H"…Lch only

Bit8 is enable only the case of " Bit7="H".

•PWM Duty 50% Mute (bit9,10:NSPMUTEL,R)

These bit set "Duty 50% fixed Mute" with Lch/Rch independence.

NSPMUTEL : "L"….Mute release,

"H"…Lch Mute

NSPMUTER : "L"….Mute release,

"H"…Rch Mute

* Duty 50 % Mute Operation are operated by one of the following setting.

• Gain control bit9,10 ( NSPMUTEL,R)

• NSPMUTE pin

• Serial control system2 mode ,bit 14 (NSPMUTE)

*Enable both output for Power and Headphone.

PWM Output (Limit Value from

∆Σ Block)

(H, L)