参数资料
型号: ST92E141K4D1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, UVPROM, 25 MHz, MICROCONTROLLER, CDIP32
封装: WINDOWED, SHRINK, CERAMIC, DIP-32
文件页数: 144/178页
文件大小: 1097K
代理商: ST92E141K4D1
68/178
ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU)
Figure 30. 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 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 10.
to 1, and PLL turned ON
an interrupt is requested
Low Power Mode enabled
Main code execution
continued
2.5 MHz
25 MHz
2.5 MHz
25 MHz
** T2 = Quartz oscillator start-up time
*T1 = PLL lock-in time
T1*
T2**
T1*
FQ=5 MHz, Vcc=5 V and T=25°C
CK_AF/16
WAIT
DX2-0
← 000
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
= 1
XTSTOP = 0
MX(1:0)
= 00
CSU_CKSEL =0
Interrupt
WAIT
Routine
(LOCK->1)
CK_AF
1
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