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参数资料
型号： ST72P60E2M1
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封装： 0.300 INCH, LEAD FREE, PLASTIC, SOP-24
文件页数： 39/118页
文件大小： 2304K
代理商： ST72P60E2M1
ST7260
27/117
POWER SAVING MODES (Cont’d)
8.3 SLOW Mode
In Slow mode, the oscillator frequency can be di-
vided by 2 as selected by the SMS bit in the Mis-
cellaneous Register. The CPU and peripherals are
clocked at this lower frequency. Slow mode is
used to reduce power consumption, and enables
the user to adapt the clock frequency to the avail-
able supply voltage.
8.4 WAIT Mode
WAIT mode places the MCU in a low power con-
sumption mode by stopping the CPU.
This power saving mode is selected by calling the
“WFI” ST7 software instruction.
All peripherals remain active. During WAIT mode,
the I bit of the CC register is forced to 0 to enable
all interrupts. All other registers and memory re-
main unchanged. The MCU remains in WAIT
mode until an interrupt or Reset occurs, whereup-
on the Program Counter branches to the starting
address of the interrupt or Reset service routine.
The MCU will remain in WAIT mode until a Reset
or an Interrupt occurs, causing it to wake up.
Refer to Figure 18.
Related Documentation
AN 980: ST7 Keypad Decoding Techniques, Im-
plementing Wake-Up on Keystroke
AN1014: How to Minimize the ST7 Power Con-
sumption
AN1605: Using an active RC to wakeup the
ST7LITE0 from power saving mode
Figure 18. WAIT Mode Flow Chart
WFI INSTRUCTION
RESET
INTERRUPT
Y
N
Y
CPU CLOCK
OSCILLATOR
PERIPH. CLOCK
I-BIT
ON
CLEARED
OFF
CPU CLOCK
OSCILLATOR
PERIPH. CLOCK
I-BIT
ON
SET
ON
FETCH RESET VECTOR
OR SERVICE INTERRUPT
4096 CPU CLOCK
CYCLES DELAY
IF RESET
Note: Before servicing an interrupt, the CC register is
pushed on the stack. The I-Bit is set during the inter-
rupt routine and cleared when the CC register is
popped.
相关PDF资料
PDF描述
ST7260E2M1/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
ST72T141K2M6XXX 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
ST72T141K2M3XXX 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
ST72T141K2MARE 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
ST7FL09Y0MATRE 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
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