UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 171

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

10.4.3 A/D converter operation mode
ANI3 by the analog input channel specification register (ADS) and A/D conversion is executed.
(1) A/D conversion operation
The operation mode of the A/D converter is the select mode. One channel of analog input is selected from ANI0 to
A/D conversion
By setting bit 7 (ADCS) of the A/D converter mode register (ADM) to 1, the A/D conversion operation of the
voltage, which is applied to the analog input pin specified by the analog input channel specification register
(ADS), is started.
When A/D conversion has been completed, the result of the A/D conversion is stored in the A/D conversion result
register (ADCR, ADCRH), and an interrupt request signal (INTAD) is generated. Once the A/D conversion has
started and when one A/D conversion has been completed, the next A/D conversion operation is immediately
started. The A/D conversion operations are repeated until new data is written to ADS.
If ADM or ADS is written during A/D conversion, the A/D conversion operation under execution is stopped and
restarted from the beginning.
If 0 is written to ADCS during A/D conversion, A/D conversion is immediately stopped.
conversion result is undefined.
Remarks 1. n = 0 to 3
ADCRH
ADCR,
INTAD
2. m = 0 to 3
Rewriting ADM
ADCS = 1
ANIn
Figure 10-12. A/D Conversion Operation
CHAPTER 10 A/D CONVERTER
User’s Manual U16898EJ5V0UD
ANIn
ANIn
Conversion is stopped
Conversion result is not retained
Rewriting ADS
ANIn
ANIn
ANIm
ANIm
ADCS = 0
ANIm
At this time, the
Stopped
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