UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 148

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

A/D conversion is canceled. In this case, A/D conversion is restarted from the beginning, if the ADCS0 bit is set (1).
10.4.2 Input voltage and conversion result
result (A/D conversion result register 0 (ADCR0)) is represented by:
146
A/D converter
operation
A/D conversion continues until bit 7 (ADCS0) of A/D converter mode register 0 (ADM0) is reset (0) by software.
If an attempt is made to write to ADM0 or A/D input selection register 0 (ADS0) during A/D conversion, the current
RESET makes A/D conversion result register 0 (ADCR0) undefined.
The relationship between the analog input voltage at the analog input pins (ANI0 to ANI6) and the A/D conversion
ADCR0 = INT (
or
(ADCR0 – 0.5)
INT( ): Function that returns the integer part of a parenthesized value
V
AV
ADCR0: Value in A/D conversion result register 0 (ADCR0)
Figure 10-5 shows the relationship between the analog input voltage and the A/D conversion result.
INTAD0
ADCR0
IN
:
REF
SAR
: AV
Analog input voltage
REF
Undefined
Sampling
Sampling
time
pin voltage
AV
V
AV
256
IN
REF
REF
CHAPTER 10 8-BIT A/D CONVERTER ( PD789407A SUBSERIES)
256 + 0.5)
80H
V
Figure 10-4. Basic Operation of 8-Bit A/D Converter
IN
< (ADCR0 + 0.5)
C0H
or 40H
User’s Manual U13952EJ3V1UD
A/D conversion
Conversion
time
AV
256
REF
Conversion
result
Conversion
result