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參數(shù)資料
| 型號： | M34554EDFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64 |
| 文件頁數(shù)： | 96/138頁 |
| 文件大?。?/td> | 1082K |
| 代理商： | M34554EDFP |
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Rev.3.00
Aug 06, 2004
page 60 of 136
REJ03B0043-0300Z
4554 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 4554 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 4554 Group. The CMCK instruction or
CRCK instruction is executed to select the ceramic resonator or
RC oscillator, respectively.
The quartz-crystal oscillator can be used for sub-clock (f(XCIN)).
MR3, MR2
00
01
10
11
Q S
QR
Q S
R
CRCK instruction
QS
R
CMCK instruction
QS
R
Internal reset signal
XOUT
XIN
Wait time
control circuit
(Note 2)
Program start
signal
Key-on wakeup signal
Notes 1: System operates by the on-chip oscillator clock (f(RING)) until the CMCK or CRCK instruction is executed
after system is released from reset.
2: The wait time control circuit is used to generate the time required to stabilize the f(XIN) or f(XCIN) oscillation.
After the certain oscillation stabilizing wait time elapses, the program start signal is output.
This circuit operates when system is released from reset or returned from RAM back-up.
EPOF instruction
POF2 instruction
+
XCOUT
XCIN
QS
R
EPOF instruction
POF instruction
+
T5F flag
MR1
1
MR0
0
Division circuit
Divided by 8
Divided by4
Divided by 2
System clock (STCK)
Instruction clock
(INSTCK)
Multi-plexer
Quartz-crystal
oscillation
On-chip oscillator
(internal oscillator)
(Note 1)
Ceramic
resonance
RC oscillation
Internal clock
generating circuit
(divided by 3)
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相關(guān)代理商/技術(shù)參數(shù) |
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| M34554M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34554MC-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556G8FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556G8HFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34556M4H-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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