M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 389

• Manufacturer Part Number: M30280F6HP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

M
R
R
20.9 A/D Converter
e
E
1
. v
Figure 20.5 Use of capacitors to reduce noise
J
6
0
C
2
9
2 /
1. Set ADCON0 (except bit 6), ADCON1, ADCON2 and ADTRGCON registers when A/D conversion is
2. When the VCUT bit in ADCON1 register is changed from “0” (Vref not connected) to “1” (Vref con-
3. To prevent noise-induced device malfunction or latchup, as well as to reduce conversion errors, insert
4. Make sure the port direction bits for those pins that are used as analog inputs are set to “0” (input
5. When using key input interrupts, do not use any of the four AN
6. The
7. When changing an A/D operation mode, select analog input pin again in the CH2 to CH0 bits of
0 .
B
0
0
stopped (before a trigger occurs).
nected), start A/D conversion after passing 1 s or longer.
capacitors between the AV
AV
connection of each pin.
mode). Also, if the TGR bit in the ADCON0 register is set to "1" (external trigger), make sure the port
direction bit for the AD
input interrupt request is generated when the A/D input voltage goes low.)
hold function, limit the
ADCON0 register and the SCAN1 to SCAN0 bits of ADCON1 register.
8
0
AD
G
4
J
SS
7
a
o r
frequency to 1MH
0 -
. n
u
pin. Similarly, insert a capacitor between the V
2
AD
3
p
0
, 1
0
(
frequency must be 10 MHz or less. For M16C/28B, set it 12 MHz or less. Without sample-and-
M
2
0
1
0
6
7
C
2 /
page 369
, 8
ANi: ANi, AN0i, AN2i (i = 0 to 7), and AN3i ( i= 0 to 2)
NOTES:
V
___________
M
CC
1. C1
2. Use thick and shortest possible wiring to connect capacitors.
1
Z
TRG
6
or more.
AD
C4
C
2 /
f o
pin is set to “0” (input mode).
frequency to 250kH
0.47 µF, C2
CC
8
3
) B
8
, V
5
REF
V
V
CC
SS
, and analog input pins (AN
MCU
0.47 µF, C3
AV
AV
V
ANi
REF
CC
SS
Z
or more. With the sample and hold function, limit the
C1
C3
100 pF, C4
CC
pin and the V
C2
0.1 µF (reference)
4
i
, AN0
to AN
V
CC
SS
i
7
pin. Figure 20.5 is an example
, AN2
pins as analog inputs. (A key
i
(i=0 to 7)) each and the
20. Precautions