adau1461 Analog Devices, Inc., adau1461 Datasheet - Page 78

• Manufacturer Part Number: adau1461
• Description: Sigmadsp Stereo, Low Power, 96 Khz, 24-bit Audio Codec With Integrated Pll Adau1461
• Manufacturer: Analog Devices, Inc.

ADAU1461
R52 to R56: Watchdog Registers, 16,592 to 16,596 (0x40D0 to 0x40D4)
A program counter watchdog is used when the core does block processing (which can span several samples). The watchdog flags an error
if the program counter reaches a specific 24-bit value (ranging from 0x000000 to 0xFFFFFF) that is set in the register map. This value
consists of three consecutive 8-bit register locations. The error flag sends a high signal to one of the GPIO pins. The watchdog function
must be enabled by setting the DOGEN bit high in Register R52 (Address 0x40D0).
The watchdog error bit (DOGER) is the 1-bit watchdog error flag that can be sent to a GPIO pin, as described in Table 77. This error flag
can connect, for example, to an interrupt pin on a microcontroller in the system. The flag is reset when the DOGEN bit goes low. This
flag can also be read back over the control port from Register R56 (Address 0x40D4).
Address
0x40D0
0x40D1
0x40D2
0x40D3
0x40D4
Table 79. Watchdog Registers
Register
R52
R53
R54
R55
R56
R57: DSP Sampling Rate Setting, 16,619 (0x40EB)
Bit 7
Table 80. DSP Sampling Rate Setting Register
Bits
[3:0]
Bit Name
DSPSR[3:0]
Bit 7
Decimal
16,592
16,593
16,594
16,595
16,596
Bit 6
Address
Description
SigmaDSP core sampling rate. The DSP sampling rate is a ratio of the base sampling rate, f
is determined by the operating frequency of the core clock. For most applications, the SigmaDSP core sampling
rate should equal the converter sampling rate (set using the CONVSR[2:0] bits in Register R17) and the serial
port sampling rate (set using the SPSR[2:0] bits in Register R64).
Setting
0000
0001
0010
0011
0100
0101
0110
0111
1000
1111
Reserved
Hex
0x40D0
0x40D1
0x40D2
0x40D3
0x40D4
Bit 6
Bit 5
Bit Name
DOGEN
DOG[23:16]
DOG[15:8]
DOG[7:0]
DOGER
Bit 5
Bit 4
Description
Watchdog enable bit.
0 = disabled (default).
1 = enabled.
Watchdog value, Bits[23:16] (MSB).
Watchdog value, Bits[15:8].
Watchdog value, Bits[7:0].
DOG[23:16]
00000000
…
11111111
Watchdog error (read-only bit).
0 = no error (default).
1 = error.
Sampling Rate
f
f
f
f
f
f
f
Serial input data rate
Serial output data rate
None
S
S
S
S
S
S
S
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Bit 4
Reserved
Reserved
Bit 3
DOG[23:16]
DOG[15:8]
DOG[7:0]
Bit 3
DOG[15:8]
00000000
…
11111111
Bit 2
Base Sampling Rate (f
96 kHz, base
48 kHz (default)
32 kHz
24 kHz
16 kHz
12 kHz
8 kHz
Bit 2
DOG[7:0]
00000000
…
11111111
DSPSR[3:0]
Bit 1
Bit 1
S
S
. The base sampling rate
= 48 kHz)
Hex Value
0x000000 (default)
…
0xFFFFFF
Bit 0
Bit 0
DOGEN
DOGER