ad1816a Analog Devices, Inc., ad1816a Datasheet - Page 37

• Manufacturer Part Number: ad1816a
• Description: Soundport Controller
• Manufacturer: Analog Devices, Inc.

REV. A
MB0R [15:0]
MB1R [15:0]
Programming Example: Generate Interrupt if No ISA Reads or Writes occur within 15 Minutes.
1) Write [SSBASE+0] with 0x0C ; Write Indirect address for TIMER BASE COUNT “register 12”
2) Write [SSBASE+2] with 0x28 ; Write TIMER BASE COUNT with (15 min 60 sec/min 100 ms) = 0x2328; Note: PTB = 1,
3) Write [SSBASE+3] with 0x23 ; Write High byte of TIMER BASE COUNT
4) Write [SSBASE+0] with 0x2C ; Write Indirect address for POWER-DOWN and TIMER CONTROL register
5) Write [SSBASE+2] with 0x00 ; Write Low byte of POWER-DOWN and TIMER CONTROL register
6) Write [SSBASE+3] with 0x31 ; Set Enable bits for PIW and PIR
7) Write [SSBASE+0] with 0x01 ; Write Indirect address for INTERRUPT CONFIG register
8) Write [SSBASE+2] with 0x82 ; Set the TE (Timer Enable) bit
9) Write [SSBASE+3] with 0x20 ; Set the TIE (Timer Interrupt Enable) bit
This register contains a Master Volume attenuation offset, which can be incremented or decremented via the Hardware Volume
Pins. This register is summed with the Master Volume attenuation to produce the actual Master Volume DAC attenuation. A mo-
mentary grounding of greater than 50 ms on the VOL_UP pin will cause a decrement (decrease in Attenuation) in this register.
Holding the pin LO for greater than 200 ms will cause an auto-decrement every 200 ms. This is also true for a momentary ground-
ing of the VOL_DN pin. A momentary grounding of both the VOL_UP and VOL_DN causes a mute and no increment or decre-
ment to occur.
When Muted, an unmute is possible by a momentary grounding of both the VOL_UP and VOL_DN pins together, a momen-
tary grounding of VOL_UP (this also causes a volume increase), a momentary grounding of VOL_DN (this also causes a volume
decrease) or a write of “0” to the VI bit in SS [BASE+1].
The AD1816A supports a timeout mechanism used in conjunction with the Timer Base Count and Timer Current Count registers
to generate a power-down interrupt. This interrupt allows software to power down the entire chip by setting the CPD bit. This
power-down control feature lets users program a time interval from 1 ms to approximately 1.8 hours in 1 ms increments. Five
power-down count reload enable bits are used to reload the Timer Current Count from the Timer Base Count when activity is
seen on that particular channel.
POM
3DD [3:0]
3DDM
BM [4:0]
VDM
VUP
VMU
CPD
[40] RESERVED
[42] DSP MAILBOX 0
[43] DSP MAILBOX 1
[44] POWERDOWN AND TIMER CONTROL
[41] HARDWARE VOLUME BUTTON MODIFIER
7
7
7
7
7
RES
6
6
6
6
6
PHONE-OUT Mute. 0 = Unmuted, 1 = Muted.
3D Depth Phat Stereo Enhancement Control. The LSB represents 6 2/3% phase expansion, 0000 = 0% and
the range is 0% to 100%.
3D Depth Mute. Writing a “1” to this bit has the same affect as writing 0s to 3DD [3:0] bits, and causes
the Phat 3D Stereo Enhancement to be turned off. 0 = Phat Stereo is on, 1 = Phat Stereo is off.
Button Modifier
Volume Down
Volume Up
Volume Mute
This register is used to send data and control information to and from the DSP.
This register is used to send data and control information to and from the DSP.
PIW
5
5
5
5
5
MB1R [15:8]
MB0R [15:8]
PIR
4
4
4
4
4
RES
RES
PAA
timer decrements every 100 ms
3
3
3
3
3
PDA
2
2
2
2
2
PD P
1
1
1
1
1
PT B
0
0
0
0
0
–37–
VMU
3D
7
7
7
7
7
PD3D GPSP
VUP
6
6
6
6
6
VDN
5
5
5
5
5
MB0R [7:0]
MB1R [7:0]
RES
4
4
4
4
4
RES
DM
3
3
3
3
3
DEFAULT = [0xXX1B]
DEFAULT = [0x0000]
BM [4:0]
DEFAULT = [0x0000]
DEFAULT = [0x0000]
DEFAULT = [0x0000]
2
2
2
2
2
AD1816A
RES
1
1
1
1
1
0
0
0
0
0