参数资料
型号: ST7PLUSA2M3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封装: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件页数: 83/136页
文件大小: 1705K
代理商: ST7PLUSA2M3
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
Power saving modes
ST7LITEUS2, ST7LITEUS5
Figure 20.
Wait mode flowchart
1.
1. Before servicing an interrupt, the CC register is pushed on the stack. The I bit of the CC register is set
during the interrupt routine and cleared when the CC register is popped.
8.4
Active-halt and Halt modes
Active-halt and Halt modes are the two lowest power consumption modes of the MCU. They
are both entered by executing the ‘HALT’ instruction. The decision to enter either in Active-
halt or Halt mode is given by the LTCSR/ATCSR register status as shown in the following
table:
WFI INSTRUCTION
RESET
INTERRUPT
Y
N
Y
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
0
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
OFF
0
ON
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
X 1)
ON
64 CPU CLOCK CYCLE
DELAY
Table 14.
Enabling/disabling Active-halt and Halt modes
LTCSR TBIE
bit
ATCSR OVFIE
bit
ATCSRCK1 bit ATCSRCK0 bit
Meaning
0x
x0
Active-halt mode disabled
00
x
0111
1
xxx
Active-halt mode enabled
x
101
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