參數(shù)資料
型號: MC68HC05P9ACDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 23/158頁
文件大小: 3885K
代理商: MC68HC05P9ACDW
ADC
Operation
ADC
Operation
The A/D conversion process is ratiometric, using two reference voltages,
V
RH and VSS. Conversion accuracy is guaranteed only if VRH is equal to
V
DD.
Pin Functions
The ADC uses five pins and shares them with port C:
PC7/V
RH
PC6/AN0, PC5/AN1, PC4/AN2, and PC3/AN3
PC7/V
RH
The voltage reference high pin (PC7/V
RH) supplies the high reference
voltage for the ratiometric conversion process. For ratiometric
conversion, the supply voltage of the analog source should be the same
as V
RH and be referenced to VSS.
Table 24. ADC I/O Register Summary
Addr.
Name
R/W
Bit 7
654321
Bit 0
$001D ADC Data Register (ADDR)
Read:
Bit 7
654321
Bit 0
Write:
Reset:
Unaffected by reset
$001E
ADC Status/Control Register (ADSCR)
Read:
CCF
ADRC
ADON
00
CH2
CH1
CH0
Write:
Reset:
00000000
= Unimplemented
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