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Main OSC
control register
(MOC)
MSTOP
STOP
High-speed
X1[CL1]
system clock
oscillator
Crystal/ceramic
Note
oscillator
X2[CL2]
External RC
Note
oscillator
Ring-OSC
oscillator
Option byte (RINGOSC)
1: Cannot be stopped
0. Can be stopped
RSTOP
Ring-OSC mode
register (RCM)
Note Select one of these as the high-speed system clock oscillator by the option byte.
CHAPTER 5 CLOCK GENERATOR
Figure 5-1. Block Diagram of Clock Generator
Internal bus
Main clock
mode register
(MCM)
MCS
MCM0
f
X
f
XP
Operation
clock switch
f
R
Prescaler
8-bit timer H1,
watchdog timer
Internal bus
Preliminary User's Manual U16846EJ1V0UD
Oscillation
stabilization time
select register
(OSTS)
OSTS2
OSTS1 OSTS0
PCC2
PCC1 PCC0
3
Oscillation stabilization
time counter
Oscillation
stabilization
MOST
MOST
MOST
MOST
MOST
time counter
11
13
14
15
16
status register
(OSTC)
3
Prescaler
f
f
f
f
X
X
X
X
2
3
4
2
2
2
2
Prescaler
Clock to peripheral
hardware
Processor clock
control register
(PCC)
Control
signal
Controller
C
P
U
f
CPU
CPU
clock
(f
)
CPU
83
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