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CHAPTER 6: DIFFERENCES FROM MASK ROM MODELS
LCD drive voltage (V
The LCD system voltage circuit generates V
other voltages by boosting or reducing the voltage V
Furthermore, the LCD drive bias option is fixed at 1/3 bias in the S1C6P366. Therefore, the 1/2 bias
(V
= V
, V
= 2•V
C2
C1
C3
Operating mode of A/D converter power supply
The A/D converter in the S1C63358 can operate in V
LCD system voltage circuit) when the supply voltage is within the range of 0.9 V to 1.6 V. When the
supply voltage is within the range of 1.6 V to 3.6 V, the A/D converter can operate in normal mode
(uses the V
supply voltage). Therefore, the operating mode of the S1C63358 needs to be switched
DD
according to the supply voltage using the VADSEL register (FF01H•D3). Since the S1C6P366 does not
operate with a less than 2.7 V supply voltage, this switching is not necessary. Although the VADSEL
register is provided for developing the S1C63358 application, the register value does not affect the
operating mode (fixed at normal mode).
Table 6.1.3.3 shows the operating mode of the A/D converter power supply, and Table 6.1.3.4 shows
the I/O map of the control registers.
S1C63358
Register
Address
D3
D2
VADSEL VDSEL
FF01H
R/W
S1C6P366
Register
Address
D3
D2
VADSEL VDSEL
FF01H
R/W
108
–V
)
C1
C3
) drive allowed in the S1C63358 cannot be evaluated.
C1
Table 6.1.3.3 Operating mode of A/D converter power supply
S1C63358
Circuit
0.9–1.6
A/D converter
V
C2
S1C6P366
Circuit
0.9–2.7
A/D converter
Not allowed
Table 6.1.3.4 I/O memory map
D1
D0
Name
Init
VADSEL
0
0
0
VDSEL
0
0
–
R
0
–
D1
D0
Name
Init
VADSEL
0
0
DBON
VDSEL
0
0
–
R
R/W
DBON
0
with the voltage regulator built-in, and generates two
C2
. (V
= 1/2•V
C2
C1
mode (uses the V
C2
Supply voltage V
(V)
DD
1.6–3.6
mode
Normal mode
Not allowed
Supply voltage V
(V)
DD
2.7–3.6
Normal mode
1
0
V
V
Power source selection for A/D converter
C2
DD
V
V
Power supply selection for oscillation system voltage regulator
C2
DD
Unused
Unused
1
0
(V
)
(V
)
(Power source selection for A/D converter)
C2
DD
(V
)
(V
)
(Power source selection for oscillation system voltage regulator)
C2
DD
Unused
1
0
General-purpose register
EPSON
, V
= 3/2•V
).
C2
C3
C2
voltage generated by the
C2
3.6–5.5
3.6–5.5
Comment
Comment
S1C6P366 TECHNICAL MANUAL
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