UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 299

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

13.4.3 A/D converter operation mode
ANI11 by the analog input channel specification register (ADS) and A/D conversion is executed.
(1) A/D conversion operation
A/D conversion
The operation mode of the A/D converter is the select mode. One channel of analog input is selected from ANI0 to
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), and an interrupt request signal (INTAD) is generated. When one A/D conversion has been
completed, the next A/D conversion operation is immediately started.
If ADS is rewritten 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 immediately before is retained.
Remarks 1. n = 0 to 11
ADCRH
ADCR,
INTAD
2. m = 0 to 11
Rewriting ADM
ADCS = 1
ANIn
Figure 13-14. A/D Conversion Operation
CHAPTER 13 A/D CONVERTER
User’s Manual U17554EJ4V0UD
ANIn
ANIn
Conversion is stopped
Conversion result immediately
before is retained
Rewriting ADS
ANIn
ANIn
ANIm
ANIm
ADCS = 0
ANIm
At this time, the
Stopped
Conversion result
immediately before
is retained
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