m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 500

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

R
R
M
e
E
3
27.11 A/D Converter
. v
J
Figure 27.2 Use of Capacitors to Reduce Noise
2
0
C
1
9
3 .
B
8 /
• Set the bit in the port direction register, which corresponds to the pin being used as the analog input, to
• When generating a key input interrupt, do not use the AN4 to AN7 pins as analog input pins (key input
• When the sample and hold function is not activated, Ø
• Set the CH2 to CH0 bits in the ADiCON0 register or the SCAN1 to SCAN0 bits in the ADiCON1 register
• Set the ADiCON0 (i=0,1) (bit 6 excluded), ADiCON1, and ADiCON2 registers while the A/D conversion
• Wait a minimum of 1 s before starting the A/D conversion when changing the VCUT bit in the ADiCON1
• Insert capacitors between pins AV
0
1
"0" (input mode). Set the bit in the port direction register, which corresponds to the AD
(input mode) if the TRG1 to TRG0 bits in the ADiCON2 register are set to "00
interrupt request is generated when the A/D input voltage becomes "L").
sample and hold function is activated, Ø
to select analog input pins again when changing A/D conversion mode.
is stopped (before trigger is generated).
register from "0" (V
after the A/D conversion is completed.
to prevent latch-ups and malfunctions due to noise and to minimize conversion errors. The same ap-
plies to pins V
3
0
3
J
G
4
a
o r
0 -
n
3 .
1
u
, 1
3
p
1
(
2
M
0
0
3
6
2
CC
C
Page 477
8 /
Note 1: C1 0.47µF, C2 0.47µF, C3 100pF, C4 0.1µF (reference)
Note 2: Use thick and shortest possible wiring to connect capacitors.
and V
, 3
REF
C4
M
3
SS
2
no connection) to "1" (V
C
f o
. Figure 27.2 shows the procedure.
8 /
4
3
Microcomputer
8
) T
V
V
8
SS
CC
CC
, V
REF
AD
AV
AV
V
ANjk
, analog input pin ANjk (j=none, 0, 2, 15; k=0 to 7) and AV
REF
frequency must be 1MHz or more.
CC
SS
REF
C1
C3
connection). Change the VCUT bit from "1" to "0"
AD
C2
frequency must be 250kHz or more. If the
27. Precautions (A/D Converter)
2
" (AD
___________
TRG
__________
).
TRG
pin, to "0"
SS