MSM7718-01 查看數據表（PDF） - Oki Electric Industry
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MSM7718-01 Datasheet PDF : 38 Pages
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MSM7718-01
(7)CR6 (VOX function control)
CR6
Initial value
B7
VOX
ON/OFF
0
B6
ON
LVL1
0
B5
ON
LVL0
0
B4
OFF
TIME
0
B3
B2
B1
B0
VOX RX. NOISE RX. NOISE RX. NOISE
IN LEVEL SEL LVL1
LVL0
0
0
0
0
B7 ... Turns ON or OFF the VOX function. 0: OFF, 1: ON
B6, 5 ... Setting of transmit side voice or silence detection level
(0, 0) : –20 dBm0
(0, 1) : –25 dBm0
(1, 0) : –30 dBm0
(1, 1) : –35 dBm0
Note: • The detection level is changeable by inserting the pad of –1 dB to –5 dB in addition to the
above values.
• Write 16384 ¥ 10 (–A/20) at address "175h". (A=pad)
Example: When –1 dB pad is inserted, 16384 ¥ 10 (– (–1)/20)
=18383.15=18383d (eliminate after the decimal point)=47CFh
B4 ... Setting of hangover time (TVXOFF) (see Figure 6)
0: 160 ms 1: 320 ms
B3 ... VOX input signal (receiver side)
0: Transmits an internal background noise.
1: Transmits a voice reception signal.
Set the VOXI pin to “0” to use this data.
B2 ... Setting of a receiver side background noise level
0: Automatic internal setting
1: Reserved
B1, 0 ... Externally-set background noise level
(0, 0) : No noise
(0, 1) : –55 dBm0
(1, 0) : –45 dBm0
(1, 1) : –35 dBm0
(8) CR7 (Detection register : read-only)
CR7
Initial value
B7
B6
B5
B4
VOX Silence level Silence level
INT
OUT
1
0
0
0
0
0
B3
B2
B1
B0
DET
DET
BUSY/ PRM/
CPT
DTMF DET21L DET21A
0
0
0
0
B7 ... Detection of transmit side voice or noise
0: Silence 1: Voice
B6, 5 ... Transmit side silence level (indicator)
(0, 0) : –10 dB or less with respect to the detection level defined by CR6-B6, B5.
(0, 1) : –5 to –10 dB with respect to the detection level defined by CR6-B6, B5.
(1, 0) : 0 to –5 dB with respect to the detection level defined by CR6-B6, B5.
(1, 1) : 0 dB or more. Refer to the detection level defined by CR6-B6, B5.
Note : The above outputs are valid only when the VOX function is enabled by bit 7 of CR6.
B4 ... External interrupt signal
Goes to a logic “0” when any change has been found in the tone detection results for call
progress tone, DTMF tone, and 2100 Hz tone.
Goes to a logic “1” when the CR7 control register is read out .
The inverted state of this bit (B4) is output to the INT pin.
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