Specifications

I-24 EPSON S1C62N82 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Oscillation Circuit)
Configuration of
oscillation circuit
The S1C62N82 and 62L82 have one oscillation circuit
(OSC1), and the S1C62A82 has two oscillation circuits
(OSC1 and OSC3). OSC1 is a crystal oscillation circuit or
CR oscillation circuit (S1C62N82/62L82) that supplies the
operating clock the CPU and peripheral circuits. OSC3 is
either a CR or ceramic oscillation circuit. When processing
with the S1C62A82 requires high-speed operation, the CPU
operating clock can be switched from OSC1 to OSC3.
Figure 4.2.4 is the block diagram of this oscillation system.
Fig. 4.2.4
Oscillation system
For S1C62A82, selection of either OSC1 or OSC3 for the
CPU's operating clock can be made through the software.
Oscillation circuit control signal
CPU clock selection signal
To CPU
To peripheral circuit
Clock
switch
OSC1
oscillation
circuit
OSC3
oscillation
circuit