UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 325

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

13.4.2 Input voltage and conversion results
A/D conversion result (stored in the 10-bit A/D conversion result register (ADCR)) is shown by the following
expression.
The relationship between the analog input voltage input to the analog input pins (ANI0 to ANI7) and the theoretical
or
where, INT( ):
Figure 13-12 shows the relationship between the analog input voltage and the A/D conversion result.
SAR = INT (
ADCR = SAR × 64
(
ADCR
64
A/D conversion result
V
AV
ADCR: A/D conversion result register (ADCR) value
SAR:
AIN
Figure 13-12. Relationship Between Analog Input Voltage and A/D Conversion Result
REF
− 0.5) ×
:
:
AV
Function which returns integer part of value in parentheses
Analog input voltage
AV
Successive approximation register
V
AIN
REF
REF
AV
1024
× 1024 + 0.5)
REF
pin voltage
≤ V
AIN
1023
1022
1021
< (
SAR
3
2
1
0
ADCR
64
CHAPTER 13 A/D CONVERTER
2048
1
User’s Manual U17260EJ6V0UD
+ 0.5) ×
1024
1
2048
3
AV
1024
1024
REF
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
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