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M16C/62P Group (M16C/62P, M16C/62PT)
6. Voltage Detection Circuit
Note
6. Voltage Detection Circuit is described in the M16C/62P only as an example.
The M16C/62PT do not use this function.
The voltage detection circuit monitors the voltage applied to the VCC1 pin in Vdet3 and Vdet 4. The VC26
to VC27 bits in the VCR2 register determine whether this circuit is enabled or disabled.
The reset level detect circuit is required for the voltage down detection reset (hardware reset 2) .
The voltage down detection circuit detects whether VCC1 is more than or less than Vdet4. The VC13 bit in
the VCR1 register determines the detection result. The voltage detect interrupt is available.
Figure 6.1 shows a voltage detection circuit Block
R E S E T
CM10 Bit=1
(Stop Mode)
V C C 1
Figure 6.1 Voltage Detection Circuit Block
R
e
. v
2
3 .
0
S
e
p
0
, 1
2
0
0
4
R
E
J
0
9
B
0
1
8
5
0 -
2
3
0
Z
V C R 2 R e g i s t e r
b7 b6
page 35
f o
3
6
4
Write to WDC register
Internal power on reset
+
≥Vdet3
E
+
≥Vdet4
Noise Rejection
E
6. Voltage Detection Circuit
WDC5 Bit
S
Q
WARM/COLD
(Cold start, warm start)
R
Voltage Down Detect Reset
(Hardware Reset 2
1 shot
Release Wait Time)
t d ( S - R )
>T
Q
I n t e r n a l R e s e t S i g n a l
( " L " a c t i v e )
V o l t a g e D o w n
D e t e c t S i g n a l
V C R 1 R e g i s t e r
b 3
VC13 Bit
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