參數(shù)資料
型號: HD4074618
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機(jī)
文件頁數(shù): 64/89頁
文件大小: 358K
代理商: HD4074618
HD404618 Series
64
Table 31 Tone Generator Control Register
TGC
Bit 1
DTMF Enable Bit
0
DTMF disabled
1
DTMF enabled
TGC
Bit 2
TONER Output Control (row)
0
Stopped
1
TONER output (active)
TGC
Bit 3
TONEC Output Control (column)
0
Stopped
1
TONEC output (active)
Tone Generator Speed Flag (TGSP: $020,Bit 2):
One-bit register which can be set and reset by the
SEM/REM and SEMD/REMD instructions. The DTMF generation circuit generates output frequencies
with a 400-kHz clock (table 30). With an 800-kHz clock, the DTMF generation circuit generates these
same frequencies by pulling the TGSP flag high.
DTMF Output:
The sine waves of the row-group and column-group are individually converted from
digital to analog in the D/A conversion circuit, which provides high-precision ladder resistance. The
DTMF output pins, TONER and TONEC, transmit the sine waves of the row-group and column-group,
respectively. Figure 41 shows thetone output equivalent circuit. Figure 42 shows the output waveform.
One cycle of this wave consists of 32 time slots, making the output waveform stable with little distortion.
Table 32 lists the frequency deviation of the MCU from standard DTMF signals.
VT
ref
GND
Switch control
TONER
TONEC
Figure 41 Tone Output Equivalent Circuit
相關(guān)PDF資料
PDF描述
HD4074618FS CONNECTOR
HD4074618H 4-Bit Single-Chip Microcomputer
HD4074618TF 4-Bit Single-Chip Microcomputer
HD4046212R AS Microcomputer Incorporating a DTMF Generator Circuit(微計(jì)算機(jī)帶雙音多頻發(fā)生器電路)
HD404628R AS Microcomputer Incorporating a DTMF Generator Circuit(微計(jì)算機(jī)帶雙音多頻發(fā)生器電路)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD4074618F 制造商:Renesas Electronics Corporation 功能描述:
HD4074618FS 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD4074618H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD4074618TF 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD4074629 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a DTMF Generator Circuit