UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 298

• 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

13.4.2 Input voltage and conversion results
theoretical A/D conversion result (stored in the 10-bit A/D conversion result register (ADCR)) is shown by the following
expression.
298
The relationship between the analog input voltage input to the analog input pins (ANI0 to ANI11) and the
or
where, INT( ):
Figure 13-13 shows the relationship between the analog input voltage and the A/D conversion result.
SAR = INT (
ADCR = SAR × 64
(ADCR − 0.5) ×
A/D conversion result
V
AV
ADCR: A/D conversion result register (ADCR) value
SAR:
AIN
Figure 13-13. Relationship Between Analog Input Voltage and A/D Conversion Result
REF
:
:
AV
Function which returns integer part of value in parentheses
Analog input voltage
AV
Successive approximation register
V
AIN
(ADCR)
REF
AV
1024
REF
REF
× 1024 + 0.5)
pin voltage
≤ V
AIN
< (ADCR + 0.5) ×
1023
1022
1021
SAR
3
2
1
0
CHAPTER 13 A/D CONVERTER
2048
1
User’s Manual U17554EJ4V0UD
1024
1
2048
AV
1024
3
REF
1024
2
2048
5
Input voltage/AV
1024
3
2043
2048
REF
1022
1024
2045
2048
1023
1024
2047
2048
ADCR
1
FFC0H
FF80H
FF40H
00C0H
0080H
0040H
0000H