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參數(shù)資料
| 型號： | UPD9930G-22 |
| 廠商： | NEC Corp. |
| 元件分類： | Codec |
| 英文描述： | LINEAR CODEC FOR DIGITAL CELLULAR TELEPHONE |
| 中文描述： | 線性編解碼器數(shù)字蜂窩電話 |
| 文件頁數(shù)： | 30/78頁 |
| 文件大小： | 336K |
| 代理商： | UPD9930G-22 |
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μ
PD9930
30
4. INTERNAL CONTROL FUNCTIONS
The
μ
PD9930 can control internal functions by commands from a microcontroller. Commands consist of 8-
bit data (D7 to D0) consisting of register address and setting data, and are written in the following internal
registers.
Register name
Control
(1)
(2)
(3)
Voice send analog gain/receiver amplifier 2 control register (TXGCR)
Voice receive analog gain control register (RXGCR)
Voice send/receive digital gain control register (DGGSR)
Voice send/receive gain control
(4)
Digital signal processing control register (DSPCR)
Digital input/output control
(5)
(6)
(7)
(8)
Tone frequency selection register (FRQSR)
Expanded tone register (EXPR1/EXPR2)
Tone control register (TONCR)
Tone gain control register (TNGCR)
Tone control
(9)
(10) Power up control command (PUPCMD)
(11) Power down control command (PDWCMD)
Input/output amplifier control register (AMPCR)
Power up/down control
(12) Test control register (TSTCR)
Test mode control
Remarks 1.
In the case of registers (1), (2), and (9) to (11), written contents are executed instantly.
2.
For registers (3) to (8) and (12), since fetch execution is made by the internal clock (125
μ
s interval),
keep 125
μ
s or more interval for write-in to the same register.
If the write-in to the same register is executed continuously, the previous command may be ignored.
3.
Even when in the stand-by mode, write-in to each internal register is possible (can be held), but the
command written in the register is executed only after clearing the stand-by mode.
4.1 SEND/RECEIVE GAIN CONTROL
An outline of send/receive gain control is shown in
Figure 4-1
.
With the
μ
PD9930, the following send and receive gain control is possible.
Send/receive gain control
Register used
Voice send gain
control
Pre-filter analog gain adjustment
(0, –3 dB)
Voice send analog gain/receiver amplifier 2
control register (TXGCR)
Digital gain fine adjustment
(0 to –2.8 dB, 0.4 dB steps)
Voice send/receive digital gain control register
(DGGSR)
Voice receive gain
control
Receiver amplifier 1 analog gain adjustment
(volume control) (0 to –31 dB, 1 dB steps)
Voice receive analog gain control register
(RXGCR)
Digital gain fine adjustment
(0 to –2.4 dB, 0.8 dB steps)
Voice send/receive digital gain control register
(DGGSR)
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