參數(shù)資料
型號: M34556G8HFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO42
封裝: 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42
文件頁數(shù): 103/147頁
文件大?。?/td> 1087K
代理商: M34556G8HFP
Rev.3.02
Dec 22, 2006
page 57 of 142
REJ03B0025-0302
4556 Group
CLOCK CONTROL
The clock control circuit consists of the following circuits.
On-chip oscillator (internal oscillator)
Ceramic resonator
RC oscillation circuit
Quartz-crystal oscillation circuit
Multi-plexer (clock selection circuit)
Frequency divider
Internal clock generating circuit
Fig. 47 Clock control circuit structure
The system clock and the instruction clock are generated as the
source clock for operation by these circuits.
Figure 47 shows the structure of the clock control circuit.
The 4556 Group operates by the on-chip oscillator clock (f(RING))
which is the internal oscillator after system is released from reset.
Also, the ceramic resonator or the RC oscillation can be used for
the main clock (f(XIN)) of the 4556 Group.
The quartz-crystal oscillator can be used for sub-clock (f(XCIN)).
MR3, MR2
00
01
10
11
CRCK instruction
Q S
R
QS
R
Internal reset signal
Key-on wakeup signal
EPOF instruction
POF2 instruction
+
XCOUT
XCIN
QS
R
EPOF instruction
POF instruction
+
T3F signal
01
MR1, MR0
00
System clock (STCK)
Instruction clock
(INSTCK)
Multi-
plexer
Quartz-crystal
oscillation
On-chip oscillator
(internal oscillator)
XOUT
XIN
Ceramic
resonance
RC oscillation
Internal clock
generating circuit
(divided by 3)
Q
RG1
10
RG0
RG2
Divided by 2
Divided by 4
Divided by 8
Division circuit
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