Cypress FM4 Series - Configuration

CHAPTER 5: Low-voltage Detection
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 177
2. Configuration
This section shows the block diagram of the Low-voltage Detection Circuit.
Block Diagram of Low-voltage Detection Circuit
 Low-voltage Detection Voltage Control Register (LVD_CTL)
This register controls whether to enable monitoring the power supply voltage for a low-voltage detection
interrupt and specifies the detection voltage for a low-voltage detection interrupt.
 Low-voltage Detection Voltage Protection Register (LVD_RLR)
This register write-protects the Low-voltage Detection Voltage Control Register.
 Low-voltage Detection Interrupt Factor Register (LVD_STR)
This register holds a low-voltage detection interrupt factor.
 Low-voltage Detection Interrupt Factor Clear Register (LVD_CLR)
This register clears a low-voltage detection interrupt factor.
 Low-voltage Detection Circuit Status Register (LVD_STR2)
This register checks the operation status of a low-voltage detection interrupt circuit.
Pins of Low-voltage Detection Circuit
The following shows the pins used in the Low-voltage Detection Circuit.
− VCC pin
The Low-voltage Detection Circuit monitors the power supply voltage of this pin.
− VSS pin
This pin is a GND pin used as a basis to detect the power supply voltage.
Voltage Control Register
-
+
Vref
V
C
C
Reset signal
-
+
Vref
LVDIE
SVHI[4:0]
Factor Register
Factor Clear Register
LVDCL
Voltage Protection Register
Register Lock
Interrupt
signal
VS
S
VS
S
VS
S
VS
S
Low-voltage
Detection Circuit
Status Register
Low-voltage
Detection Interrupt
Low-voltage
Detection Interrupt
Low-voltage Detection
Low-voltage Detection
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