Voltage Detection Circuit - Renesas M16C/29 Series User Manual

M 1 6 C 2 / 9 G o r u p

5.5 Voltage Detection Circuit

Note
V = 5 V is assumed in 5.5 Voltage Detection Circuit.
CC
Voltage detection circuit in the M16C/29 Group, T-ver. and V-ver. cannot be used.
The voltage detection circuit has the reset level detection circuit and the low voltage detection circuit. The
reset level detection circuit monitors the voltage applied to the V
detection circuit detects V
whether the individual circuit is enabled.
Use the reset level detection circuit for brown-out detection reset.
The low voltage detection circuit also monitors the voltage applied to the V
tion circuit use the VC13 bit in the VCR1 register to detect V
detection interrupt can be used in the voltage detection circuit.
RESET
CM10 Bit=1
(Stop Mode)
VCC
Figure 5.4 Voltage Detection Circuit Block
R e . v 1 1 . 2 M r a 3 . , 0 2 0 0 7
R E J 0 9 B 0 1 0 1 0 - 1 1 2
is Vdet3 or below. Use bits VC27 and VC26 in the VCR2 register to determine
CC
VCR2 Register
b7 b6
page 38
f o 4 5 8
pin. The MCU is reset if the reset level
CC
is above or below Vdet4. The low voltage
CC
Reset level
detection circuit
+
>Vdet3
E
+
>Vdet4
Noise Rejection
E
Low voltage
detection circuit
pin. The low voltage detec-
CC
Brown-out Detect Reset
(Hardware Reset 2
1 shot
Release Wait Time)
td(S-R)
>T
Q
Internal Reset Signal
("L" active)
Low Voltage
Detect Signal
VCR1 Register
b3
VC13 Bit
5. Resets