UPD78F0138 NEC, UPD78F0138 Datasheet - Page 118

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

118
Mask option
1: Cannot be stopped
0: Can be stopped
X1
X2
Ring-OSC mode
register (RCM)
MCC
CLS
X1 oscillator
STOP
Ring-OSC
oscillator
RSTOP
MSTOP
Main OSC
control
register
(MOC)
f
XP
f
R
Internal bus
MCS
clock switch
Operation
Figure 5-1. Block Diagram of Clock Generator
MCM0
Prescaler
Main clock
mode register
(MCM)
8-bit timer H1,
watchdog timer
f
X
CHAPTER 5 CLOCK GENERATOR
User’s Manual U16228EJ2V0UD
Internal bus
MOST
stabilization time counter
11
OSTS2
MOST
X1 oscillation
13
f
2
X
OSTS1 OSTS0
MOST
14
2
f
Prescaler
X
3
2
Oscillation
stabilization time
select register
(OSTS)
MOST
15
2
f
X
3
Prescaler
MOST
16
2
f
X
4
Oscillation
stabilization
time counter
status
register
(OSTC)
Clock to peripheral
hardware
CLS
4
CSS PCC2
Processor clock
control register
(PCC)
1/2
f
PCC1 PCC0
CPU
Controller
f
XT
clock oscillator
Subsystem
Control signal
FRC
C
P
U
Watch clock,
clock output
function
CPU clock
(f
CPU
)
XT1
XT2