Specifications

II-50 EPSON S1C62N82 TECHNICAL SOFTWARE
CHAPTER 3: PERIPHERAL CIRCUITS (SVD Circuit and Heavy Load Protection Function)
Operation through the SVDON circuit is useful as a
measure against unforeseen circumstances, such as drop
in supply voltage due to expiring battery life, by way of
promptly operating the heavy load protection function.
The following procedures for controlling the SVD circuit
by the software are the same as those described in "Con-
trol of the SVDON circuit":
➀ Set the SVDON register to "1".
➁ Provide at least 100 µs waiting time.
➂ Set the SVDON register to "0".
➃ Read-out from the SVDDT register.
If the supply voltage is lower than the criteria voltage, the
heavy load protection function will automatically start
operating after the above procedure ➂ has been per-
formed.
Because supply voltage detection by hardware every 2 Hz
(0.5 sec) will automatically be performed when the heavy
load protection function operates, refrain from operating
the SVD circuit with the software in order to minimize
power current consumption. The operation timing chart
is shown in Figure 3.9.3.
100 µs or more
Supply voltage
Criteria voltage
SVDON register
2 Hz clock
SVD circuit
SVDDT register
Heavy load
protection mode
HLMOD register
Fig. 3.9.3
Timing chart of heavy
load protection
function operation
through the SVDON
register