W925E625 Datasheet, PDF (61/75 Pages) Winbond – 8-bit CID MICROCONTROLLER

W925E/C625
IFX OPC-9
DTMFR1
DTMFR1[7:4] are reserved bits and must be 0000b.
BIT3~BIT0
ACCEPTABLE ERROR PERCENTAGE TO SAMPLE 4 PERIOD OF ROW FREQ.
0000 0.6% (default)
0001 2.5%
001X 3.5%
01XX Reserved
1XXX Reserved
DTMFR2
BIT3~BIT0
ACCEPTABLE ERROR PERCENTAGE TO SAMPLE 4 PERIOD OF COL FREQ.
0000 0.5% (default)
0001 1.5%
001X 2.5%
01XX Reserved
1XXX Reserved
The acceptable error percentage may have small variation by different test environments.
DTMFR2.4=0 DTMF receiver works as a DTMF receiver
DTMFR2.4=1 DTMF receiver works as a tone detector
DTMFR2.5=0
DTMF PT counter is up counter type, change of detected frequency does not effect
counter
DTMFR2.5=1
DTMF PT counter is up counter type, change of detected frequency resets DTMF
PT counter
DTMFR2.6=0
DTMF AT counter is up-down counter type, up counting when no DTMF detected,
down counting if DTMF detected again.
DTMFR2.6=1
DTMF AT counter is up counter type, up counting when no DTMF detected, pause
counting if DTMF detected again.
DTMFR2.7: reserved
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Publication Release Date: July 4, 2005
Revision A10