CXD3018Q/R
Peak meter
XLAT
SQCK
SQSO
L0
L1
L2 L3
L4 L5
L6 L7
R0 R1 R2 R3 R4 R5 R6 R7
(Peak meter)
Setting the SOCT command of $8X to 0 and the SL1 and SL0 commands of $BX to 0 and 1, respectively,
results in peak detection mode. The SQSO output is connected to the peak register. The maximum PCM data
values (absolute value, upper 8 bits) for the left and right channels can be read from SQSO by inputting 16
clocks to SQCK. Peak detection is not performed during SQCK input, and the peak register does not change
during readout. This SQCK input judgment uses a retriggerable monostable multivibrator with a time constant
of 270µs to 400µs. The time during which SQCK input is high should be 270µs or less. Also, peak detection is
restarted 270µs to 400µs after SQCK input.
The peak register is reset with each readout (16 clocks input to SQCK).
The maximum value in peak detection mode is detected and held in this status until the next readout. When
switching to peak detection mode, readout should be performed one time initially to reset the peak register.
Peak detection can also be performed for previous value hold and average value interpolation data.
Traverse monitor count value setting
These bits are set when monitoring the traverse condition of the SENS output according to the COUT
frequency division.
Command bit
Processing
TRM1
TRM0
0
0
1
1
0
1
0
1
1/64 frequency division
1/128 frequency division
1/256 frequency division
1/512 frequency division
Monitor output switching
The monitor output can be switched to the various signals by setting the MTSL1 and MTSL0 commands of $B.
Output data
Symbol
XUGF
XPCK
GFS
C2PO
Command bit
MTSL1
MTSL0
0
0
1
0
1
0
XUGF
MNT1
RFCK
XPCK
MNT0
XPCK
GFS
MNT3
XROF
C2PO
C2PO
GTOP
– 47 –
ETC [ ETC ]
