參數(shù)資料
型號: 68HC05M68HC
廠商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 79/130頁
文件大?。?/td> 1541K
代理商: 68HC05M68HC
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(guān)PDF資料
PDF描述
68HC070KH12 8 BIT MICROCONTROLLER UNITS
68HC08KH12 8 BIT MICROCONTROLLER UNITS
68HC08M68HC HCMOS Microcontroller Unit
68HC11 Technical Data
68HC12 Advance Information
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
68HC05P4A 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SPECIFICATION (General Release)
68HC05P4A_1 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SPECIFICATION (General Release)
68HC05P5 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SPECIFICATION(General Release)
68HC05P9A 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SPECIFICATION(General Release)
68HC05P9A_1 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SPECIFICATION(General Release)