参数资料
型号: S3P9664-SM
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO24
封装: 0.300 INCH, SOP-24
文件页数: 5/148页
文件大小: 784K
代理商: S3P9664-SM
A/D CONVERTER
S3C9664/P9664 (Preliminary Spec)
12-2
INTERNAL REFERENCE VOLTAGE LEVELS
In the ADC function block, the analog input voltage level is compared to the reference voltage. The analog input
level must remain within the range AV
SS to VDD.
Different reference voltage levels are generated internally along the resistor tree during the analog conversion
process for each conversion step. The reference voltage level for the first bit conversion is always 1/2 V
DD .
USING A/D PINS FOR STANDARD DIGITAL INPUT
The ADC module's input pins are alternatively used as digital input in port 1. The AD0–AD5 share pin names are
P1.0–P1.5
A/D CONVERTER CONTROL REGISTER (ADCON)
The A/D converter control register, ADCON, is located at address D8H, Page 0. ADCON has four functions:
— Bits 6-4 select an analog input pin (AD0–AD51).
— Bit 3 indicates the status of the A/D conversion.
— Bit2-1 select clock source.
— Bit 0 starts the A/D conversion.
Only one analog input channel can be selected at a time. You can dynamically select any one of the six analog
input pins (AD0–AD5) by manipulating the 3-bit value for ADCON.6–ADCON.4
It’s recomanded that the clock source determinding the conversion speed would be less than 2.5 MHz to get
sound results.
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