AK4645AEZ Datasheet, PDF (61/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

[AK4645A]
(2)-2. READ໋ྩ
R/W bit͕ “1”ͷ৔߹ɺAK4645A͸READಈ࡞Λߦ͍·͢ɻࢦఆ͞ΕͨΞυϨεͷσʔλ͕ग़ྗ͞ΕͨޙɺϚ
ελ͕ఀࢭ৚݅ΛૹΒͣ֬ೝԠ౴Λੜ੒͢ΔͱɺαϒΞυϨε͕ࣗಈతʹΠϯΫϦϝϯτ͞Εɺ࣍ͷΞυϨ
εͷσʔλΛಡΈग़͢͜ͱ͕Ͱ͖·͢ɻΞυϨε “24H”ͷσʔλΛಡΈग़ͨ͠ޙɺ͞Βʹ࣍ͷΞυϨεΛಡ
Έग़͢৔߹ʹ͸ΞυϨε“00H”ͷσʔλ͕ಡΈग़͞Ε·͢ɻ
AK4645A͸ΧϨϯτΞυϨεϦʔυͱϥϯμϜϦʔυͷ2ͭͷREAD໋ྩΛ͍࣋ͬͯ·͢ɻ
(2)-2-1. ΧϨϯτΞυϨεϦʔυ
AK4645A͸಺෦ʹΞυϨεΧ΢ϯλΛ͓࣋ͬͯΓɺΧϨϯτΞυϨεϦʔυͰ͸͜ͷΧ΢ϯλͰࢦఆ͞Εͨ
ΞυϨεͷσʔλΛಡΈग़͠·͢ɻ಺෦ͷΞυϨεΧ΢ϯλ͸࠷ʹޙΞΫηεͨ͠ΞυϨεͷ࣍ͷΞυϨε
஋Λอ͍࣋ͯ͠·͢ɻྫ͑͹ɺ࠷ʹޙΞΫηε(READͰ΋WRITEͰ΋)ͨ͠ΞυϨε͕ “n”Ͱ͋ΓɺͦͷޙΧ
ϨϯτΞυϨεϦʔυΛߦͬͨ৔߹ɺΞυϨε “n+1”ͷσʔλ͕ಡΈग़͞Ε·͢ɻΧϨϯτΞυϨεϦʔυ
Ͱ͸ɺAK4645A͸READ໋ྩͷεϨʔϒΞυϨε(R/W bit = “1”)ͷೖྗʹରͯ֬͠ೝԠ౴Λੜ੒͠ɺ࣍ͷΫϩ
οΫ͔Β಺෦ͷΞυϨεΧ΢ϯλͰࢦఆ͞ΕͨσʔλΛग़ྗͨ͠ͷͪ಺෦Χ΢ϯλΛ1ͭΠϯΫϦϝϯτ͠
·͢Ňσʔλ͕ग़ྗ͞ΕͨޙŊϚελ͕֬ೝԠ౴Λੜ੒ͤͣఀࢭ৚݅ΛૹΔͱɺREADಈ࡞͸ऴྃ͠·͢ɻ
S
T
A
R/W="1"
R
T
SDA
Slave
S _Address
A
C
K
Data(n)
Data(n+1)
Data(n+2)
A
A
A
C
C
C
K
K
K
Figure 62. ΧϨϯτΞυϨεϦʔυ
S
T
O
P
Data(n+x)
A
C
K
P
A
C
K
(2)-2-2. ϥϯμϜΞυϨεϦʔυ
ϥϯμϜΞυϨεϦʔυʹΑΓ೚ҙͷΞυϨεͷσʔλΛಡΈग़͢͜ͱ͕Ͱ͖·͢ɻϥϯμϜΞυϨεϦʔ
υ͸READ໋ྩͷεϨʔϒΞυϨε(R/W bit = “1”)Λೖྗ͢ΔલʹɺμϛʔͷWRITE໋ྩΛೖྗ͢Δඞཁ͕͋
Γ·͢ɻϥϯμϜΞυϨεϦʔυͰ͸࠷ॳʹ։࢝৚݅Λೖྗ͠ɺ࣍ʹWRITE໋ྩͷεϨʔϒΞυϨε(R/W bit
= “0”)ɺಡΈग़͢ΞυϨεΛॱ࣍ೖྗ͠·͢ɻAK4645A͕͜ͷΞυϨεೖྗʹରͯ֬͠ೝԠ౴Λੜ੒ͨ͠ޙɺ
࠶ૹ৚݅ɺREAD໋ྩͷεϨʔϒΞυϨε(R/W bit= “1”)Λೖྗ͠·͢ɻAK4645A͸͜ͷεϨʔϒΞυϨεͷ
ೖྗʹରͯ֬͠ೝԠ౴Λੜ੒͠ɺࢦఆ͞ΕͨΞυϨεͷσʔλΛग़ྗ͠ɺ಺෦ΞυϨεΧ΢ϯλΛ1ͭΠϯ
ΫϦϝϯτ͠·͢ɻσʔλ͕ग़ྗ͞ΕͨޙɺϚελ͕֬ೝԠ౴Λੜ੒ͤͣఀࢭ৚݅ΛૹΔͱɺREADಈ࡞͸
ऴྃ͠·͢ɻ
S
T
A
R/W="0"
R
T
SDA
Slave
S _Address
Sub
Address(n)
A
C
K
S
T
A
R/W="1"
R
T
Slave
S _Address
A
A
C
C
K
K
Data(n)
Data(n+1)
A
A
C
C
K
K
Figure 63. ϥϯμϜΞυϨεϦʔυ
S
T
O
P
Data(n+x)
P
A
A
C
C
K
K
MS0986-J-00
- 61 -
2008/07