Specifications

II-42 EPSON S1C6S2N7 TECHNICAL SOFTWARE
CHAPTER 3: PERIPHERAL CIRCUITS (SVD Circuit and Heavy Load Protection Function)
Supply Voltage Detection (SVD) Circuit and
Heavy Load Protection Function
The S1C6S2N7 Series has a built-in supply voltage detection
circuit and drop in supply voltage may be detected by con-
trolling the register on the I/O memory. Criteria voltages are
as follows:
Model Criteria Voltage
S1C6S2N7/S1C6S2A7 2.4 V ± 0.15 V
S1C6S2L7/S1C6S2B7 1.2 V ± 0.10 V
Moreover, when the battery load becomes heavy, such as
during external piezo buzzer driving or external lamp light-
ing, heavy load protection function is built-in in case the
supply voltage drops.
S1C6S2L7/S1C6S2B7 operate at 0.9 V due to the SVD
circuit and heavy load protection function.
3.8
SVD circuit and
heavy load protec-
tion function mem-
ory map
Table 3.8.1 I/O memory map
*1 Initial value following initial reset
*2 Not set in the circuit
*3 Undefined
*4 Reset (0) immediately after being read
*5 Always 0 when being read
*6 Refer to main manual
Address Comment
Register
D3 D2 D1 D0 Name SR
*1
10
0FAH
HLMOD 0 SVDDT SVDON
HLMOD
0
SVDDT
SVDON
0
0
0 ON OFF
Heavy load protection mode register
Supply voltage detection data
Supply voltage detection ON/OFF
RR/W R/W
Heavy
load
Supply
voltage
low
Normal
load
Supply
voltage
normal
*5