M16C28 Datasheet, PDF (59/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
5. Reset
Low voltage detection interrupt generation circuit
Low voltage detection circuit
VC27
D4INT clock(the
clock with which it
1/8
operates also in
wait mode)
VC13
VCC +
Vref -
Noise
rejection
(Rejection wide:200 ns)
Low voltage detection
signal
“H” when VC27 bit= 0
(disabled)
CM10
Watchdog timer block
CM02
WAIT instruction(wait mode)
DF1, DF0
002
012
102
112
1/2
1/2
1/2
D42 bit is set to “0”(not detected) by
writing a “0” in a program. VC27 bit
is set to “0” (low voltage detection
circuit disabled), the D42 bit is set to
“0”.
Noise rejection
circuit
Digital
filter
D42
Watchdog
timer interrupt
signal
D41
D43
Low voltage
detection
interrupt signal
Oscillation stop,
re-oscillation
detection
interrupt signal
Watchdog timer
underflow signal
This bit is set to “0”(not detected) by writing a “0” by program.
D40
Non-maskable
interrupt signal
Figure 5.8 Low Voltage Detection Interrupt Generation Block
VCC
VC13 bit
sampling
sampling
sampling
sampling
Output of the digital filter ⁽²⁾
D42 bit
Low voltage detection
interrupt signal
No low voltage detection interrupt signals are
generated when the D42 bit is “1”.
Set to “0” by
program (not
detected)
Set to “0” by a
program (not
detected)
NOTES:
1. D40 bit in the D4INT register is set to “1”(low voltage detection interrupt enabled).
2. Output of the digital filter shown in Figure 5.8.
Figure 5.9 Low voltage Detection Interrupt Generation Circuit Operation Example
Rev. 2.00 Jan. 31, 2007 ^{page 39} of 385
REJ09B0047-0200