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R8C18 Datasheet(PDF) 69 Page - Renesas Technology Corp

Part # R8C18
Description  RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/1x SERIES
PDF  257 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C18 Datasheet(HTML) 69 Page - Renesas Technology Corp

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R8C/18 Group, R8C/19 Group
10. Clock Generation Circuit
Rev.1.30
Apr 14, 2006
Page 54 of 233
REJ09B0222-0130
Figure 10.1
Clock Generation Circuit
S Q
R
1/2
1/2
1/2
1/2
1/2
S Q
R
HRA00
HRA01 = 1
HRA01 = 0
On-chip oscillator clock
CM14
Voltage
detection
circuit
CPU clock
a
b
c
d
e
OCD2 = 0
OCD2 = 1
Divider
Oscillation
stop
detection
Main clock
XOUT
CM13
CM05
XIN
CM02
WAIT
instruction
CM10 = 1 (stop mode)
a
d
c
h
b
CM06 = 0
CM17 to CM16 = 11b
CM06 = 1
CM06 = 0
CM17 to CM16 = 10b
CM06 = 0
CM17 to CM16 = 01b
CM06 = 0
CM17 to CM16 = 00b
Detail of divider
Oscillation Stop Detection Circuit
Pulse generation
circuit for clock
edge detection and
charge, discharge
control circuit
Main clock
Forcible discharge when OCD0(1) = 0
Charge,
discharge
circuit
Oscillation stop detection
interrupt generation
circuit detection
Watchdog
timer interrupt
OCD2 bit switch signal
CM14 bit switch signal
Oscillation stop detection,
Watchdog timer,
Voltage monitor 2 interrupt
e
g
UART0
Timer C
Timer Z
Timer X
fRING-fast
fRING
fRING-S
g
f1
f2
f4
f8
f32
h
INT0
1/128
fRING128
Watchdog
timer
Comparator
OCD1(1)
NOTE:
1. Set the same value in bits OCD1 and OCD0.
High-speed
on-chip
oscillator
Low-speed
on-chip
oscillator
Power-on
reset circuit
CM02, CM05, CM06: Bits in CM0 register
CM10, CM13, CM14, CM16, CM17: Bits in CM1 register
OCD0, OCD1, OCD2: Bits in OCD register
HRA00, HRA01: Bits in HRA0 register
Voltage monitor
2 interrupt
System clock
HRA1 register
HRA2 register
Frequency adjustable
CM13
UART1
RESET
Power-on reset
Software reset
Interrupt request



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