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R5F21142SP-U0 View Datasheet(PDF) - Renesas Electronics

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R5F21142SP-U0 Datasheet PDF : 277 Pages
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R8C/14 Group, R8C/15 Group
6. Voltage Detection Circuit
6. Voltage Detection Circuit
The voltage detection circuit is a circuit to monitor the input voltage to the VCC pin. This circuit monitors the
VCC input voltage by the program. And the voltage monitor 1 reset, voltage monitor 2 interrupt and voltage
monitor 2 reset can be used.
Table 6.1 lists the Specification of Voltage Detection Circuit and Figures 6.1 to 6.3 show the Block
Diagrams. Figures 6.4 to 6.6 show the Associated Registers.
Table 6.1 Specification of Voltage Detection Circuit
VCC Monitor
Item
Voltage to Monitor
Detection Target
Monitor
Process When Voltage Is Reset
Detected
Interrupt
Digital Filter
Switch
Enabled / Disabled
Sampling Time
Voltage Detection 1
Voltage Detection 2
Vdet1
Vdet2
Whether passing
Whether passing
through Vdet1 by rising through Vdet2 by rising
or falling
or falling
None
VCA13 bit in VCA1
register
Whether VCC is higher
or lower than Vdet2
Voltage Monitor 1 Reset Voltage Monitor 2 Reset
Reset at Vdet1 > VCC; Reset at Vdet2 > VCC
Restart CPU operation at Restart CPU operation
VCC > Vdet1
after a specified time
None
Voltage Monitor 2
Interrupt
Interrupt request at
Vdet2 > VCC and VCC >
Vdet2 when digital filter
is enabled;
Interrupt request at
Vdet2 > VCC or VCC >
Vdet2 when digital filter
is disabled
Available
Available
(Divide-by-n of fRING-S) (Divide-by-n of fRING-S)
x4
x4
n : 1, 2, 4 and 8
n : 1, 2, 4 and 8
Rev.2.10 Jan 19, 2006 Page 25 of 253
REJ09B0164-0210
 

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