參數(shù)資料
型號: MC68HC05P9AP
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 119/158頁
文件大?。?/td> 1106K
代理商: MC68HC05P9AP
ADC
Operation
MOTOROLA
ADC
119
Operation
The A/D conversion process is ratiometric, using two reference voltages,
V
RH
and V
SS
. Conversion accuracy is guaranteed only if V
RH
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
PC 7/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 V
SS
.
Table 24. ADC I/O Register Summary
Addr.
Name
R/W
Read:
Write:
Reset:
Bit 7
Bit 7
6
6
5
5
4
4
3
3
2
2
1
1
Bit 0
Bit 0
$001D ADC Data Register (ADDR)
Unaffected by reset
$001E
ADC Status/Control Register (ADSCR)Read:
CCF
ADRC
ADON
0
0
CH2
CH1
CH0
Write:
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
7-mc68hc05p9a
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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