S1C63358 TECHNICAL MANUAL
EPSON
113
CHAPTER 5: SUMMARY OF NOTES
CHAPTER
5 S
UMMARY
OF
N
OTES
5.1 Notes for Low Current Consumption
The S1C63358 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.
Table 5.1.1 Circuits and control registers
Circuit (and item)
CPU
CPU operating frequency
Oscillation system voltage regulator
LCD system voltage circuit
Supply voltage booster
SVD circuit
Control register
HALT instruction
CLKCHG, OSCC
VDC
LPWR
LPWR, VDSEL, VADSEL
SVDON
Refer to Chapter 7, "Electrical Characteristics" for current consumption.
Below are the circuit statuses at initial reset.
CPU
: Operating status
CPU operating frequency
: Low speed side (CLKCHG = "0")
OSC3 oscillation circuit is in OFF status (OSCC = "0")
Oscillation system voltage regulator
: Low speed side 1.35 V (VDC = "0")
LCD system voltage circuit
: OFF status (LPWR = "0")
Supply voltage booster
: Voltage regulator is driven with V
DD
, Normal mode
(LPWR = "0", VDSEL = "0", VADSEL = "0")
SVD circuit
: OFF status (SVDON = "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.