Datasheet

78K0/Ix2 CHAPTER 11 A/D CONVERTER
R01UH0010EJ0500 Rev.5.00 365
Feb 28, 2012
Figure 11-1. Block Diagram of A/D Converter
INTAD
TMX0, TMX1
A/D trigger
ADCS FR2 FR1 ADCEFR0
AVSS
ANI0/P20
ANI1/P21/AMPOUT
Note1
ANI2/P22
ANI3/P23
ANI4/P24
ANI5/P25
ANI6/P26
ANI7/P27
ANI8/P70
PGA output
Note2
LV1 LV0
5
6
ADS3 ADS2 ADS1 ADS0
ADO
AS
V12SEL
AVREF
AVSS
Internal voltage 1.2 V
Sample & hold circuit
A/D voltage comparator
ADCS bit
ADCE bit
A/D conversion result register
( ADCR, ADCRL, ADCRH)
A/D conversion result register
for TMX0 synchronization
(ADCRX0, ADCRX0L)
A/D converter mode
register0 (ADM0)
Analog input channel
specification register (ADS)
Internal bus
ADPC0
8
ADPC3 ADPC2 ADPC1ADPC4ADPC5ADPC6ADPC7
ADPC8
3
ADPC10 ADPC9
A/D port configuration
register 0 (ADPC0)
A/D port configuration
register 1 (ADPC1)
A/D conversion result register
for TMX1 synchronization
(ADCRX1, ADCRX1L)
AD
TRG1
AD
TRG0
Comparison voltage
generator
Successive
approximation
register (SAR)
Controller
Selector
Selector
Notes 1. Products with operational amplifier of 78K0/IA2 and 78K0/IB2 only
2. Products with operational amplifier of 78K0/IY2, 78K0/IA2, and 78K0/IB2 only
Caution In the 78K0/IY2 and 78K0/IA2, V
SS functions alternately as the ground potential of the A/D converter.
Be sure to connect V
SS to a stabilized GND (= 0 V).
Remark A/D converter analog input pins differ depending on products.
 78K0/IY2: ANI0, ANI1, ANI3 to ANI5
 78K0/IA2: ANI0 to ANI5
 78K0/IB2: ANI0 to ANI8