參數(shù)資料
型號: MC68HC705P6AMDWER2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: LEAD FREE, SOIC-28
文件頁數(shù): 108/130頁
文件大小: 1541K
代理商: MC68HC705P6AMDWER2
Analog Subsystem
Digital Section
MC68HC705P6A — Rev. 2.0
Advance Information
MOTOROLA
Analog Subsystem
79
9.5 Digital Section
The following paragraphs describe the operation and performance of
digital modules within the analog subsystem.
9.5.1 Conversion Times
Each input conversion requires 32 internal clock cycles, which must be
at a frequency equal to or greater than 1 MHz.
9.5.2 Internal versus External Oscillator
If the internal clock is 1 MHz or greater (i.e., external oscillator 2 MHz or
greater), the internal RC oscillator must be turned off and the external
oscillator used as the conversion clock.
If the MCU internal clock frequency is less than 1 MHz (2 MHz external
oscillator), the internal RC oscillator (approximately 1.5 MHz) must be
used for the A/D converter clock. The internal RC clock is selected by
setting the ADRC bit in the ADSC register.
When the internal RC oscillator is being used, these limitations apply:
1. Since the internal RC oscillator is running asynchronously with
respect to the internal clock, the conversion complete bit (CC) in
register ADSC must be used to determine when a conversion
sequence has been completed.
2. Electrical noise will slightly degrade the accuracy of the A/D
converter. The A/D converter is synchronized to read voltages
during the quiet period of the clock driving it. Since the internal and
external clocks are not synchronized, the A/D converter will
occasionally measure an input when the external clock is making
a transition.
相關PDF資料
PDF描述
MC68HC705P6ASD 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER
MC68HC705P6AMDWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705P6ASD 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER
MC68HC705P6ACSD 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER
MCHC705P6ACSDR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER
相關代理商/技術參數(shù)
參數(shù)描述
MC68HC705P6AMP 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HC705P6CDW 制造商:Motorola Inc 功能描述:
MC68HC705P6CP 制造商:Freescale Semiconductor 功能描述: 制造商:Motorola Inc 功能描述:
MC68HC705P6ECDW 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
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