Chapter 6
Power Supply Voltage Detection
VI - 2 Overview
6.1 Overview
6.1.1 Power Supply Voltage Detection Overview
This LSI has the power supply voltage detector (PSVD) to detect power supply voltage and generate interrupt.
PSVD compares the power supply voltage (V
DD30
) and the detection voltage (V
LVI
), and generates the interrupt
(LVIIRQ) when the level of V
DD30
crosses that of V
LVI
. V
LVI
can be changed between from 1.1 V to 2.9 V with
the LVICTR0 register.
PSVD operates regardless of the value of the CPU control register.
Figure:6.1.1 Power Supply Detection Waveform
V
LVI
Power supply voltage detection function is OFF (LVION=0)
(1) Though power supply voltage (at falling) falls below the detection voltage (V
LVI
), the interrupt request is not generated and the LVIOUT bit is not cleare
(2) Though power supply voltage (at rising) exceeds the detection voltage (V
LVI
), the interrupt request is not generated and the LVIOUT bit is not cleared.
Power supply voltage detection function is ON (LVION=1)
(3) As power supply voltage (at falling) falls below the detection detection voltage (V
LVI
), the interrupt request is generated and the LVIOUT bit is cleared.
(4) As power supply voltage (at rising) exceeds the detection voltage (V
LVI
), the interrupt request is generated and the LVIOUT bit is set.
Interrupt request
(1) (2) (3) (4)
LVION
bit
voltage (V
DD30
)
LVION set
LVIOUT
bit
To Next Page
Loading...
