Renesas M65881AFP - Manual (Page 13)

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 NSPMUTEL Lch Duty 50% Mute for PWM Output active non-active L
10 NSPMUTER Rch Duty 50% Mute for PWM Output 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)