參數(shù)資料
型號(hào)： MC68HC705F8FU
廠商： MOTOROLA INC
元件分類(lèi)： 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(yè)數(shù)： 108/126頁(yè)
文件大?。?/td> 736K
代理商： MC68HC705F8FU
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MOTOROLA
9-2
MC68HC05F8
DTMF/MELODY GENERATOR
9
sampling rate of the desired “staircase sine wave”. This pulse train then clocks a divide-by-28
binary counter (PLA scanner) whose 28 decoded outputs sequentially scan 28 memory locations
of a 28x6 sine wave generator (PLA) in 28 time steps (M). The 6 resulting digital sine wave bits
are then fed separately to a 6-bit resistor ladder to produce a current signal.
The method for generating a square wave tone in a path is similar to that of a sine wave tone
except that only the most signicant bit of a sine wave PLA is fed to the 6-bit resistor ladder (the
other 5 bits are masked by the Sine/Square wave select) to produce a current signal. The resulting
square wave tone has exactly the same frequency and phase as a sine wave tone for the same
frequency control register value.
After obtaining the current signals from the row and column paths, the row current signal is rst
attenuated by 2dB, and is then summed with the column current signal, and is nally fed to an
active 7KHz low pass lter to reduce harmonic distortion. The resulting DTMF or melody signal is
output to the TONEOUT pin, which is normally buffered to drive a buzzer.
The generator provides not only DTMF and melody but also a square wave pacier tone (Tone).
This signal is also extracted from the most signicant bit of the sine wave PLA of the row path, but
is not subjected to the lter. The ToneX signal is output to the TONEX pin, which is normally
connected to a loudspeaker.
Figure 9-1 DTMF/Melody Generator Block Diagram
Row Frequency
Divider
PLA
Scanner
Data
Validator
Row Frequency Control Register
Column Frequency Control Register
Column Frequency
Divider
TGER
TGEC
MS1
MS0
Sinewave PLA
28 x 6-bits
PLA
Scanner
Sinewave PLA
28 x 6-bits
Sine/Square
Wave Select
Sine/Square
Wave Select
MUX
6-bit Resistor
Ladder
6-bit Resistor
Ladder
High Group
Pre-emphasis
+
3.58MHz
÷ 2
TONEX
TONEOUT
current summer
+
active low-pass lter
MSB
LSB
Tone Control
register bits 4 & 5
Tone Control
register bits 6 & 7
5
6
5
6
TPG
80
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC705G1B 制造商:Rochester Electronics LLC 功能描述:- Bulk
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MC68HC705J1ACDW 功能描述:IC MCU 4MHZ 1.2K OTP 20-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類(lèi)型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤(pán) 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱(chēng):497-9032STM32F101T8U6-ND
MC68HC705J1ACP 功能描述:IC MCU 4MHZ 1.2K OTP 20-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類(lèi)型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤(pán) 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱(chēng):497-9032STM32F101T8U6-ND
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