μPD78F921x ONLY) User’s Manual U16994EJ6V0UD 159 Figure 9-2 shows the block d" />
參數(shù)資料
型號: UPD78F9512GR-JJG-A
廠商: Renesas Electronics America
文件頁數(shù): 70/175頁
文件大小: 0K
描述: MCU 8BIT SGL CHIP 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
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-SSOP(0.173",4.40mm 寬)
包裝: 托盤
CHAPTER 9 A/D CONVERTER (
μPD78F921x ONLY)
User’s Manual U16994EJ6V0UD
159
Figure 9-2 shows the block diagram of A/D converter.
Figure 9-2. Block Diagram of A/D Converter
VDD
VSS
INTAD
2
ADS1
ADS0
VSS
ANI0/P20/TI000
TOH1
ANI1/P21/TI010/
TO00/INTP0
ANI2/X2/P22
ANI3/X1/P23
ADCS
FR2
FR1
ADCE
FR0
3
Sample & hold circuit
Voltage comparator
Controller
A/D conversion result register
(ADCR, ADCRH)
Analog input
channel specification
register (ADS)
A/D converter mode
register (ADM)
Internal bus
Successive
approximation
register (SAR)
Selector
D/A converter
Cautions 1. In
μPD78F921x, VSS functions alternately as the ground potential of the A/D converter. Be
sure to connect VSS to a stabilized GND (= 0 V).
2. In
μPD78F921x, VDD functions alternately as the A/D converter reference voltage input. When
using the A/D converter, stabilize VDD at the supply voltage used (2.7 to 5.5 V).
9.2
Configuration of A/D Converter
The A/D converter consists of the following hardware.
(1) ANI0 to ANI3 pins
These are the analog input pins of the 4-channel A/D converter. They input analog signals to be converted into
digital signals. Pins other than the one selected as the analog input pin by the analog input channel specification
register (ADS) can be used as I/O port pins.
(2) Sample & hold circuit
The sample & hold circuit samples the input signal of the analog input pin selected by the selector when A/D
conversion is started, and holds the sampled analog input voltage value during A/D conversion.
(3) D/A converter
The D/A converter is connected between VDD and VSS, and generates a voltage to be compared with the analog
input signal.
(4) Voltage comparator
The voltage comparator compares the sampled analog input voltage and the output voltage of the D/A converter.
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