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4571 bảng dữ liệu(PDF) 49 Page - Renesas Technology Corp

tên linh kiện 4571
Giải thích chi tiết về linh kiện  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  126 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4571 bảng dữ liệu(HTML) 49 Page - Renesas Technology Corp

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Rev.1.02
May 25, 2007
Page 49 of 124
REJ03B0179-0102
4571 Group
CLOCK CONTROL
The clock control circuit consists of the following circuits.
• Ceramic 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 50 shows the structure of the clock control circuit.
Fig 50. Clock control circuit structure
XIN
00
01
10
11
MR3, MR2
Division circuit
divided by 8
divided by 4
divided by 2
Internal clock
generation circuit
(divided by 3)
System clock
(STCK)
Instruction clock
(INSTCK)
Ceramic
oscillation circuit
Voltage drop detection circuit
(reset occurs)
S
R
Q
EPOF instruction + POF instruction
Key-on wakeup signal
RESET
Oscillation
stop signal



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