μPD78F921x ONLY) User’s Manual U16994EJ6V0UD 168 9.4.2 Input voltage and conv" />
參數(shù)資料
型號: UPD78F9212CS-CAB-A
廠商: Renesas Electronics America
文件頁數(shù): 80/175頁
文件大?。?/td> 0K
描述: MCU 8BIT 4KB FLASH 16PIN
標(biāo)準(zhǔn)包裝: 400
系列: 78K0S/Kx1+
核心處理器: 78K0S
芯體尺寸: 8-位
速度: 10MHz
外圍設(shè)備: LVD,POR,PWM,WDT
輸入/輸出數(shù): 13
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-DIP(0.300",7.62mm)
包裝: 托盤
CHAPTER 9 A/D CONVERTER (
μPD78F921x ONLY)
User’s Manual U16994EJ6V0UD
168
9.4.2
Input voltage and conversion results
The relationship between the analog input voltage input to the analog input pins (ANI0 to ANI3) and the theoretical
A/D conversion result (stored in the 10-bit A/D conversion result register (ADCR)) is shown by the following
expression.
ADCR = INT (
× 1024 + 0.5)
or
(ADCR
0.5) ×
≤ VAIN < (ADCR + 0.5) ×
where, INT( ):
Function which returns integer part of value in parentheses
VAIN:
Analog input voltage
VDD:
VDD pin voltage
ADCR: 10-bit A/D conversion result register (ADCR) value
Figure 9-11 shows the relationship between the analog input voltage and the A/D conversion result.
Figure 9-11. Relationship Between Analog Input Voltage and A/D Conversion Result
1023
1022
1021
3
2
1
0
03FFH
03FEH
03FDH
0003H
0002H
0001H
0000H
A/D conversion result
SAR
ADCR
1
2048
1
1024
3
2048
2
1024
5
2048
Input voltage/VDD
3
1024
2043
2048
1022
1024
2045
2048
1023
1024
2047
2048
1
VAIN
VDD
1024
VDD
1024
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