S1C63358 TECHNICAL MANUAL
EPSON
29
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Oscillation Circuit)
4.4 Oscillation Circuit
4.4.1 Configuration of oscillation circuit
The S1C63358 has two oscillation circuits (OSC1 and OSC3). OSC1 is either a crystal or a CR oscillation
circuit that supplies the operating clock to the CPU and peripheral circuits. OSC3 is either a CR or a
ceramic oscillation circuit. When processing with the S1C63358 requires high-speed operation, the CPU
operating clock can be switched from OSC1 to OSC3 by the software. To stabilize operation of the internal
circuits, the operating voltage V
D1
must be switched according to the oscillation circuit to be used. Figure
4.4.1.1 is the block diagram of this oscillation system.
Oscillation circuit control signal
CPU clock selection signal
To CPU
To peripheral circuits
Clock
switch
Oscillation system
voltage regulator
OSC3
oscillation circuit
OSC1
oscillation circuit
Operating voltage selection signal
V
D1
Divider
Fig. 4.4.1.1 Oscillation system block diagram
Содержание S1C63358
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