參數(shù)資料
型號(hào)： MC68HC705F8FU
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 1.8 MHz, MICROCONTROLLER, PQFP64
封裝： QFP-64
文件頁數(shù)： 109/126頁
文件大?。?/td> 736K
代理商： MC68HC705F8FU
MC68HC05F8
MOTOROLA
9-3
DTMF/MELODY GENERATOR
9
9.3
DMG Registers
The DMG has three registers, Row Frequency Control register and Column Frequency Control
register, for row and column frequencies selection respectively; and Tone Control register for tone
output control and mode selection.
9.3.1
Row Frequency Control Register (FCR)
Column Frequency Control Register (FCC)
FCR0-4 and FCC0-4 control the frequencies of the tone signals on the row and the column paths
respectively. The bit description for DTMF and Melody tone generation are shown in Table 9-1 and
Table 9-2 respectively.
Note:
The legal values in the FCR are illegal to the FCC, and vice versa. An illegal value to
these registers will produce a tri-state at the TONEOUT output pin, and a logic high at
the TONEX output pin.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Row Frequency Control
$13
FCR4
FCR3
FCR2
FCR1
FCR0 000u uuuu
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Column Frequency Control
$14
FCC4
FCC3
FCC2
FCC1
FCC0 000u uuuu
Table 9-1 Bit Description for DTMF Generation
FCR
FCC
TONE
Standard
Frequency
(Hz)
Tone Output
Frequency
(Hz)
Frequency
Deviation
(%)
$00
See Note
fR1
697
694.8
0.32
$01
fR2
770
770.1
–0.02
$02
fR3
852
854.2
–0.03
$03
fR4
941
940.0
0.11
See note
$10
fC1
1209
1206.0
0.244
$11
fC2
1336
1331.7
0.324
$12
fC3
1477
1486.5
–0.645
$13
fC4
1633
1639.0
–0.367
TPG
81
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參數(shù)描述
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