Voltage Detection Circuit - Renesas M16C FAMILY series Hardware Manual

M 1 6 C 2 / 8 G o r u p ( M 1 6 C

5.5 Voltage Detection Circuit

Note
V =5V is assumed in 5.5 Voltage Detection Circuit.
CC
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
reset level detection circuit detects V
to determine whether the individual circuit is enabled.
Use the reset level detection circuit for brown-out 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 Low Voltage Detection Circuit Block
R e . v 2 0 . 0 J a . n 3 , 1 2 0 0 7
R E J 0 9 B 0 0 4 7 0 - 2 0 0
2 / , 8 M 1 6 C 2 / 8 ) B
is Vdet3 or below. Use bits VC27 and VC26 in the VCR2 register
CC
VCR2 Register
b7 b6
page 35
f o 3 8 5
pin. The microcomputer is reset if the
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. Reset