Serial Control - Renesas M65881AFP Specification Sheet

M65881AFP

SERIAL CONTROL

1. Gain Control Mode
bit Flag name
1 MODE1 Mode setting1
2 MODE2 Mode setting2
3 TEST1 Test Mode 1
4 TEST2 Test Mode 2
5 NSLMT1 Output Limit 1
6 NSLMT2 Output Limit 2
7 GCONT1 Channel selection for Gain Control Block 1
8 GCONT2 Channel selection for Gain Control Block 2
Lch Duty 50% Mute for PWM Output
9 NSPMUTEL
Rch Duty 50% Mute for PWM Output
10 NSPMUTER
11
12 GAIN0 Gain Data Index (MSB)
13 GAIN1 Gain Data Index
14 GAIN2 Gain Data Index
15 GAIN3 Gain Data Index
16 GAIN4 Gain Data Index (LSB)
17 GAIN5 Gain Data Mantissa (MSB)
18 GAIN6 Gain Data Mantissa
19 GAIN7 Gain Data Mantissa
20 GAIN8 Gain Data Mantissa
21 GAIN9 Gain Data Mantissa
22 GAIN10 Gain Data Mantissa
23 GAIN11 Gain Data Mantissa
24 GAIN12 Gain Data Mantissa (LSB)
•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
Table 1-1a Limit Value [ In case of 6bit mode, system2 mode bit 17( NSOBIT )="L".]
NSLMT1,2
(L, L)
(H, L)
(L, H)
(H, H)
Table 1-1b Limit Value [ In case of 5bit mode, system2 mode bit 17( NSOBIT )="H".]
NSLMT1,2
(L, L)
(H, L)
(L, H)
(H, H)
•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
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,
NSPMUTER : "L"....Mute release,
* 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)
Rev.1.00 2003.05.08
Functional Explanation
Output Limit Value of gain
±0.9375
±0.90625
±0.875
±0.84375
Output Limit Value of gain
±0.90625
±0.875
±0.84375
±0.8125
"H"...Lch only
"H"...Lch Mute
"H"...Rch Mute
page 13 of 23
H
Refer to Table 1-1.
L/R Independence
Lch
active
active
(bit5, 6 : NSLMT1, 2)
PWM Output (Limit Value from
63 values (±31)
61 values (±30)
59 values (±29)
57 values (±28)
PWM Output ( Limit Value from
31 value (±15)
31 value (±15)
29 value (±14)
29 value (±14)
*Enable both output for Power and Headphone.
No setting bits means " Don't care".
L
"L" fixed
"L" fixed
"L" fixed
"L" fixed
L/R Common
Rch
non-active
non-active
Block)
Block)
INIT
–
–
L
L
L
L
L
L
L
L
–
H
L
L
L
L
H
L
L
L
L
L
L
L