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5 S
CHAPTER
5.1 Notes for Low Current Consumption
The S1C63454 contains control registers for each of the circuits so that current consumption can be
reduced.
These control registers reduce the current consumption through programs that operate the circuits at the
minimum levels.
The following lists the circuits that can control operation and their control registers. Refer to these when
programming.
Refer to Chapter 7, "Electrical Characteristics" for current consumption.
Below are the circuit statuses at initial reset.
CPU operating frequency: Low speed side (CLKCHG = "0")
Oscillation system voltage regulator: Low speed side 1.3 V (VDC = "0")
LCD system voltage circuit: OFF status (LPWR = "0")
Also, be careful about panel selection because the current consumption can differ by the order of several
µA on account of the LCD panel characteristics.
S1C63454 TECHNICAL MANUAL
UMMARY OF
Table 5.1.1 Circuits and control registers
Circuit (and item)
CPU
CPU operating frequency
Oscillation system voltage regulator
LCD system voltage circuit
CPU: Operating status
OSC3 oscillation circuit is in OFF status (OSCC = "0")
However, it is fixed at 2.2 V when the CR oscillation circuit has
been selected as the OSC1 oscillation circuit. Whether the VDC
register value is "0" or "1" does not matter.
N
OTES
Control register
HALT instruction
CLKCHG, OSCC
VDC
LPWR
EPSON
CHAPTER 5: SUMMARY OF NOTES
91
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