upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 66

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

66
X1/P23/ANI3
X2/P22/ANI2
Note Select the high-speed internal oscillator, crystal/ceramic oscillator, or external clock input circuit as the
system clock source by using the option byte.
Crystal/ceramic
System clock
oscillator
External clock
High-speed
oscillation
oscillation
STOP
internal
input
System clock oscillation
stabilization time counter
Note
OSTS1 OSTS0
f
X
Oscillation stabilization
time select register (OSTS)
Low-speed internal oscillation
mode register (LSRCM)
Figure 5-1. Block Diagram of Clock Generators
Option byte
1: Cannot be stopped.
0: Can be stopped.
Internal bus
f
2
X
Watchdog timer
Prescaler
CHAPTER 5 CLOCK GENERATORS
2
f
X
2
User’s Manual U16994EJ3V0UD
Internal bus
PPCC1 PPCC0
Low-speed
oscillator
internal
LSRSTOP
Preprocessor clock
control register (PPCC)
f
XP
f
RL
Prescaler
f
2
XP
2
Clock to peripheral
hardware (f
PCC1
8-bit timer H1,
watchdog timer
Processor clock
control register (PCC)
XP
)
Controller
CPU clock
(f
CPU
)