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ST92163 bảng dữ liệu(PDF) 80 Page - STMicroelectronics

tên linh kiện ST92163
Giải thích chi tiết về linh kiện  8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS, 20K ROM, 2K RAM, I2C, SCI, & MFT
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST92163 bảng dữ liệu(HTML) 80 Page - STMicroelectronics

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ST92163 - RESET AND CLOCK CONTROL UNIT (RCCU)
Figure 38. Example of Low Power Mode programming
Begin
WFI_CKSEL
← 1
WFI status
User’s Program
LPOWFI
← 1
User’s Program
WFI
End
PROGRAM FLOW
COMMENTS
SYSTEM CLOCK FREQUENCY
Interrupt
Quartz not divided by 2
PLL multiply factor
Multiplier divider’s factor set
Wait for the
CK_AF clock selected when WFI
Wait For Interrupt
No code is executed until
Interrupt served
fixed to 6.
to 2, and PLL turned ON
an interrupt is requested
Low Power Mode enabled
Main code execution
continued
8 MHz
24 MHz
8 MHz
24 MHz
** T2 = Quartz oscillator start-up time
*T1 = PLL lock-in time
T1*
T2**
T1*
FQ=8 MHz, Vcc=5 V and T=25°C
RC
WAIT
DX2-0
← 001
Xtal is selected to
restart the PLL quickly
CSU_CKSEL
1
PLL is
system clock source
CSU_CKSEL<- 1
while the CK_AF is
the system clock
CKAF_SEL <- 0
The system CK
switches to Xtal
The PLL is locked
and becomes the
system clock
XTSTOP
← 0
To restart Xtal and PLL
To stop PLL and Xtal when
a WFI occurs
XTSTOP
← 1
PLL locking
SET UP AFTER RESET PHASE:
DIV2
= 0
XTSTOP = 0
MX(1:0)
= 01
CSU_CKSEL =0
Interrupt
WAIT
Routine
(LOCK->1)
oscillator
RC
oscillator



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