Programming Notes - Epson S1C63358 Technical Manual

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Setting of Power Supply and Operating Mode)
VADSEL: Power supply selection register for A/D converter voltage circuit (FF01H•D3)
Selects the power supply for the A/D converter voltage circuit.
When "1" is written: V
When "0" is written: V
Reading: Valid
When "1" is written to the VADSEL register, the A/D converter voltage circuit enters the V
operates with V output from the LCD booster. When "0" is written to the VADSEL register, the A/D
C2
converter voltage circuit operates with V
When switching from the normal mode to the V
taking a 100 msec or longer interval for the V
At initial reset, this register is set to "0".
When using the A/D converter with a 1.6 V or less power supply voltage, set the V

4.2.6 Programming notes

(1) When operating the S1C63358 with a 0.9–1.4 V power supply voltage, software control is necessary.
Set the oscillation system voltage regulator to the V
voltage is used, don't set the oscillation system voltage regulator into the V
(2) When using the A/D converter with a 0.9–1.6 V power supply voltage, software control is necessary.
Set the A/D converter voltage circuit to the V
used, don't set the A/D converter circuit into the V
(3) If the power supply voltage is out of the specified voltage range for an operating mode, do not switch
to the operating mode. It may cause malfunction or increase current consumption.
(4) When switching from the normal mode to the V
be set to "1" after taking a 100 msec or longer interval for the V
LPWR register to "1".
(5) When switching from the V
(VDSEL = "0" or VADSEL = "0") and turn the LCD booster OFF (LPWR = "0", if LCD is unused).
Simultaneous processing with a single instruction may cause malfunction.
(6) The OSC3 oscillation circuit can operate only in the normal mode with a power supply voltage from
2.3 V to 3.6 V.
26
C2
DD
and the operating mode becomes the normal mode.
DD
C2
to stabilize from setting the LPWR register to "1".
C2
C2
mode to the normal mode, use separate instructions to switch the mode
C2
EPSON
mode, the VADSEL register should be set to "1" after
mode. When 1.4 V or more power supply
C2
mode. When 1.6 V or more power supply voltage is
mode.
C2
mode, the VDSEL and/or VADSEL registers should
C2
to stabilize from switching the
C2
mode and
C2
mode.
C2
mode.
C2
S1C63358 TECHNICAL MANUAL