S1C63656 TECHNICAL MANUAL
EPSON
9
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
CHAPTER
2 P
OWER
S
UPPLY
AND
I
NITIAL
R
ESET
2.1 Power Supply
The S1C63656 operating power voltage is as follows. The operating power voltage range depends on a
mask option selection whether the OSC3 clock is used or not.
Table 2.1.1 Operating voltage
OSC3 oscillation circuit
Used
Not used
Maximum operating frequency
4 MHz (OSC3)
32 kHz (OSC1 only)
Operating voltage
2.4 V to 3.6 V
1.1 V to 3.6 V
The S1C63656 operates by applying a single power supply within the above range between V
DD
and V
SS
.
The S1C63656 itself generates the voltage necessary for all the internal circuits by the built-in power
supply circuits shown in Table 2.1.2.
Table 2.1.2 Power supply circuits
Circuit
OSC1 circuit
Internal circuits
(when OSC3 is not used)
OSC3 and internal circuits
(when OSC3 is used)
LCD driver
Power supply
Voltage regulator for
OSC1 oscillation circuit
Voltage regulator for
OSC1 oscillation circuit
High-speed operation
voltage regulator
LCD system voltage
circuit
Output voltage
V
OSC
V
OSC
V
D3
V
C1
–V
C3
Note: • Do not drive external loads with the output voltage from the internal power supply circuits.
• See Chapter 7, "Electrical Characteristics", for voltage values and drive capability.
External
power
supply
LCD system
voltage regulator
LCD driver
V
DDA
V
DD
V
C1
V
C2
V
C3
CA
CB
V
OSC
V
D1
V
SS
V
SSA
V
C1
V
C1
V
C2
V
C3
V
OSC
V
D3
Mask option
Mask option
V
D1
Voltage booster
LCD system voltage circuit
LPWR
Voltage regulator for
OSC1 oscillation circuit
OSC1
oscillation circuit
CPU,
internal circuits
R/f
converter
High-speed operation
voltage regulator
+
OSC3
oscillation circuit
Fig. 2.1.1 Configuration of power supply
The two switches in dotted boxes shown in Figure 2.1.1 are mask options for the OSC3 oscillation circuit.
The figure shows the switch status when an option (an oscillator type) that uses the OSC3 oscillation
circuit has been selected. When the option (No Operation) to disable the OSC3 oscillation circuit is
selected, both the switches are flipped to the other position.
Содержание S1C63656
Страница 1: ...Technical Manual CMOS 4 BIT SINGLE CHIP MICROCOMPUTER S1C63656 Technical Hardware S1C63656 ...
Страница 4: ......
Страница 6: ......