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152 EPSON S1C63558 TECHNICAL AMANUAL
CHAPTER 5: SUMMARY OF NOTES
CHAPTER 5SUMMARY OF NOTES
5.1 Notes for Low Current Consumption
The S1C63558 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
LCD system voltage circuit
SVD circuit
FSK demodulator
Control register
HALT instruction
CLKCHG, OSCC
LPWR
SVDON
FSKON
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")
LCD system voltage circuit: OFF status (LPWR = "0")
SVD circuit: OFF status (SVDON = "0")
FSK demodulator: OFF status (FSKON = "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.