參數(shù)資料
型號(hào): 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): 43/78頁
文件大?。?/td> 336K
代理商: UPD9930G-22
μ
PD9930
43
Register address
FRQSR
D7
D6
D5
D4
D3
D2
D1
D0
1
0
0
FRQSEL4
FRQSEL4 to FRQSEL0
00000 to 10100
Tone frequency selection
Refer to
Table 4-5 Function Specification by Tone Frequency Selection Register
.
FRQSEL3 FRQSEL2 FRQSEL1 FRQSEL0
4.3.1 Tone Frequency Selection Register (FRQSR)
This is a 5-bit register for specifying tone 1 (high group frequency for DTMF and four types of single tones)
and tone 2 (low group frequency for DTMF) frequency combinations.
Figure 4-9 Tone Frequency Selection Register
Write operation in this register is instantaneously executed and retained when a command is received, but
change of tone generation or generating tone is executed only when "1" is written for START/STOP control bit
of the tone control register (refer to
Figure 4-11 Tone Control Register
).
When a user registration tone is selected, the tone specified by the expanded tone register (refer to
Figure
4-10 Expanded Tone Frequency Registration Procedure
) is generated.
Caution Do not input a command that sets a tone oscillation frequency after inputting a tone oscillation
command (writing "1" to the START/STOP control bit of the tone control register).
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