w925e625 ETC-unknow, w925e625 Datasheet - Page 60

• Manufacturer Part Number: w925e625
• Description: 8-bit Cid Microcontroller
• Manufacturer: ETC-unknow

CID Input Gain Control
The CID input gain and input hysteresis are controllable by internal CID gain control registers. CIDGD
and CIDGA registers determine the 6 internal CID gain control registers. CID gain control data register
(CIDGD) presents the data bus. The lower 3 bits of CID gain control address register (CIDGA)
presents the address. The rising edge of CIDGA.4 will latch the CIDGD in the corresponding internal
CID gain control register. The 6 internal CID gain control registers are addressed as following table.
Setting the 6 registers as the suggestion value guarantees the CID spec.
The signals to set internal CID gain control registers is shown in Figure 6-25
ADDRESS (CIDGA.2-0)
X=0 DTMF receiver works a DTMF decoder, X=1 DTMF receiver works as a tone detector.
000
001
002
003
004
005
Figure 6-25 Internal CID Gain Control Register Setting Waveform
DTMFR1: DTMF register1
DTMFR2: DTMF register2
PGAF: Programmable gain control alert tone and
FSK
PGAD: Programmable gain control DTMF
PHAD: Programmable hysteresis alert tone and
DTMF
PHFL: Programmable hysteresis FSK and low
pass filter
INTERNAL CID GAIN CONTROL REGISTER
CIDGA.3
CIDGA
CIDGD
CIDGA<2:0>
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CIDGD
Rising latch
W925E/C625
0000 0001B
011X 0001B
99H
A7H
35H
33H
SUGGESTION
VALUE