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): 77/130頁
文件大?。?/td> 1541K
代理商: 68HC05M68HC
MC68HC705P6A
Rev. 2.0
Advance Information
MOTOROLA
Analog Subsystem
77
Advance Information
MC68HC705P6A
Section 9. Analog Subsystem
9.1 Contents
9.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
9.3
9.3.1
9.3.2
9.3.3
Analog Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Ratiometric Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Reference Voltage (V
REFH
) . . . . . . . . . . . . . . . . . . . . . . . . .78
Accuracy and Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
9.4
Conversion Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
9.5
9.5.1
9.5.2
9.5.3
Digital Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Conversion Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Internal versus External Oscillator . . . . . . . . . . . . . . . . . . . .79
Multi-Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .80
9.6
A/D Status and Control Register (ADSC). . . . . . . . . . . . . . . . .80
9.7
A/D Conversion Data Register (ADC). . . . . . . . . . . . . . . . . . . .82
9.8
A/D Subsystem Operation during Halt/Wait Modes . . . . . . . . .82
9.9
A/D Subsystem Operation during Stop Mode. . . . . . . . . . . . . .82
9.2 Introduction
The MC68HC705P6A includes a 4-channel, multiplexed input, 8-bit,
successive approximation analog-to-digital (A/D) converter. The A/D
subsystem shares its inputs with port C pins PC3
PC7.
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