Fujitsu FR81S User Manual
CHAPTER 5: CLOCK
3. Configuration
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : CLOCK
FUJITSU SEMICONDUCTOR CONFIDENTIAL
9
Figure 3-8 Diagram of the Clock System
CPU Clock （CCLK)
On Chip Bus Clock（HCLK)
Peripheral Clock （PCLK1)
Peripheral Clock（PCLK2)
CAN Prescaler Clock
Main Clock（MCLK)
Sub Clock（SCLK)
CR Oscillation
From Master
PLL Output(PLLCLK)
To Slave
EXT-Bus Clock(TCLK)
From Master
To Slave
To Slave
MD0,MD1,P006
I / O
Po
rt
XBS Crossbar Switch
FR81s CPU core
Instruction Data
On chip bus layer2
External Bus
I / F
Peripheral Bus
Bridge
CAN prescaler
Watchdog timer(SW and HW)
Delay intrrupt
Interrupt controller
RTC／WDT1 Calibration
Ｉ
/Ｏ port setting
Low power consumption setting register
16
32
Wild register
I / O
Po
rt
On chip bus layer1
Debug Interface
Regulator
Interrupt request batch read
DMA transfer request generate/clear
Real time clock
Clock supervisor
O
n
chi
p
bus
(A
H
B
)
XBS
Clock control （Clock setting,
Main timer, Sub timer, PLL timer）
M P U
32bi
t P
er
ipher
al
B
us
(A
P
B
)
Clock control （devide control）
Bus
performance
counter
16bi
t P
t P
er
ipher
al
al
B
us
BackUp
RAM
Timing Protection
Unit
PPG(48ch)
Reload timer (8ch)
8bit DA converter (2ch)
External interrupt input(16ch)
32bit Output compare(6ch)
Base timer (2ch)
U/D counter (2ch)
32bit Free-run timer(3ch)
32bit Input capture(6ch)
Multi-function serial interface (12ch)
DMAC
(16 ch)
CAN (3ch)
CRC
Operation mode
register
Wave generator (6ch)
12bit AD converter (32ch + 16ch)
16bit Free-run timer (3ch)
16bit Input capture (4ch)
Power-on rset
CR oscillator
Low voltage detection
（
External power supply low voltage detection）
Reset control register
NMI
Flash
・
Main Flash 256K/384K/512K/768K/
1024KB
・
WorkFlash 64KB
RAM
48K/64K/96K/128K
Clock monitor
Bus Bridge (32bit <-> 16bit)
RAM ECC Control(XBS RAM)
Clock / Bus
Bridge
RAM ECC Control
(BackUp RAM)
Async Bus Bridge (PCLK1 <-> PCLK2)
Bus Bridge (32bit <-> 16bit)
16bit Output compare (6ch)
Async Bus Bridge (PCLK1 <-> PCLK2)
Low voltage detection
（
Internal power supply low voltage detection）
MB91520 Series
MN705-00010-1v0-E
170