CHAPTER 5 CLOCK GENERATORS
User’s Manual U17446EJ3V1UD
71
Figure 5-1. Block Diagram of Clock Generators
X1/P121
X2/P122
PCC1
C
P
U
STOP
PPCC1 PPCC0
OSTS1 OSTS0
LSRSTOP
Controller
Selector
CPU clock
(f
CPU
)
Internal bus
Internal bus
Oscillation stabilization
time select register (OSTS)
Preprocessor clock
control register (PPCC)
Processor clock
control register (PCC)
System clock oscillation
stabilization time counter
Selector
Prescaler
Clock to peripheral
hardware (f
XP
)
8-bit timer H1,
watchdog timer
Option byte
1: Cannot be stopped.
0: Can be stopped.
Low-speed internal oscillation
mode register (LSRCM)
Low-speed
internal
oscillator
Prescaler
System clock
oscillator
Note
External clock
input
Crystal/ceramic
oscillation
High-speed
internal
oscillation
Watchdog timer
f
X
f
X
2
f
XP
2
2
f
XP
f
X
2
2
f
RL
Note
Select the high-speed internal oscillator, crystal/ceramic oscillator, or external clock input as the system
clock source by using the option byte.
Содержание 78K0S/KB1+
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