Power Supply Voltage Detection Circuit (Svd3) - Epson S1C31D01 Software Manual

3.17 Power Supply Voltage Detection Circuit (SVD3)

SVD3 is a supply voltage detector to monitor the power supply voltage on the VDD pin or the voltage applied to
an external pin.
This example shows VDD voltage drop detection.
Hardware Setup
Example requires evaluation board configured to power from the debugger adapter.
A jumper across J2-35 and J2-36 must be installed.
Connect evaluation board to PC by USB cable.
Operations
1. Software prepares to watch the VDD pin dropping the voltage below some limit.
2. USB cable is disconnected.
3. Software detects voltage drop and reports it on the terminal.
Example of Output
- CPU clock- seCLG_IOSC (20000000)
SVD is configured to detect the voltage drop.
Please Disconnect USB cable.
Power voltage drop detected
Interrupt Low voltage occurred
IRQ handler called
Exit
52 Seiko Epson Corporation
S1C31D01 Peripheral Circuit Sample
Software Manual (Rev.3.00)