參數(shù)資料
型號(hào): M3455AGC-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP52
封裝: 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52
文件頁數(shù): 112/150頁
文件大小: 1818K
代理商: M3455AGC-XXXFP
Rev.1.02
Nov 26, 2008
Page 62 of 146
REJ03B0224-0102
455A Group
CLOCK CONTROL
The clock control circuit consists of the following circuits.
High-speed on-chip oscillator
Ceramic resonator
Low-speed on-chip oscillator
Quartz-crystal oscillation circuit
Frequency divider
Internal clock generating circuit
The system clock and the instruction clock are generated as the
source clock for operation by these circuits.
Figure 59 shows the structure of the clock control circuit.
The 455A Group operates by the high-speed on-chip oscillator
clock (f(HSOCO)) which is the internal oscillator after system is
released from reset.
The quartz-crystal oscillator can be used for sub-clock (f(XCIN)).
Fig 59. Clock control circuit structure
High-speed on-chip oscillator
(internal oscillator)
00
01
10
11
MR3, MR2
Division circuit
Divided by 8
Divided by 4
Divided by 2
Internal clock
generating circuit
(divided by 3)
System clock (STCK)
Instruction clock
(INSTCK)
XIN
XOUT
Ceramic
resonance
EPOF instruction + POF instruction
Key-on wakeup signal
Internal reset signal
RG0
RG1
QS
R
10
01
00
MR1, MR0
XCIN
XCOUT
Quartz-crystal
oscillation
RG2
EPOF instruction + POF2 instruction
11
Low-speed on-chip oscillator
(Low-speed internal oscillator)
RG3
QS
R
T3F signal
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