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参数资料
型号： ST7FLITE19BF0B6
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, PDIP20
封装： 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-20
文件页数： 98/159页
文件大小： 2855K
代理商： ST7FLITE19BF0B6
ST7LITE1xB
43/159
POWER SAVING MODES (Cont’d)
9.4.1 Halt Mode Recommendations
– Make sure that an external event is available to
wake up the microcontroller from Halt mode.
– When using an external interrupt to wake up the
microcontroller, re-initialize the corresponding I/
O as “Input Pull-up with Interrupt” before execut-
ing the HALT instruction. The main reason for
this is that the I/O may be wrongly configured
due to external interference or by an unforeseen
logical condition.
– For the same reason, re-initialize the level sensi-
tiveness of each external interrupt as a precau-
tionary measure.
– The opcode for the HALT instruction is 0x8E. To
avoid an unexpected HALT instruction due to a
program counter failure, it is advised to clear all
occurrences of the data value 0x8E from memo-
ry. For example, avoid defining a constant in pro-
gram memory with the value 0x8E.
– As the HALT instruction clears the interrupt mask
in the CC register to allow interrupts, the user
may choose to clear all pending interrupt bits be-
fore executing the HALT instruction. This avoids
entering other peripheral interrupt routines after
executing the external interrupt routine corre-
sponding to the wake-up event (reset or external
interrupt).
9.5 ACTIVE-HALT MODE
ACTIVE-HALT mode is the lowest power con-
sumption mode of the MCU with a real time clock
available. It is entered by executing the ‘HALT’ in-
struction. The decision to enter either in ACTIVE-
HALT or HALT mode is given by the LTCSR/ATC-
SR register status as shown in the following table:
The MCU can exit ACTIVE-HALT mode on recep-
tion of a specific interrupt (see Table 5, “Interrupt
Mapping,” on page 37) or a RESET.
– When exiting ACTIVE-HALT mode by means of
a RESET, a 256 or 4096 CPU cycle delay oc-
curs. After the start up delay, the CPU resumes
operation by fetching the reset vector which
woke it up (see Figure 28).
– When exiting ACTIVE-HALT mode by means of
an interrupt, the CPU immediately resumes oper-
ation by servicing the interrupt vector which woke
it up (see Figure 28).
When entering ACTIVE-HALT mode, the I bit in
the CC register is cleared to enable interrupts.
Therefore, if an interrupt is pending, the MCU
wakes up immediately (see Note 3).
In ACTIVE-HALT mode, only the main oscillator
and the selected timer counter (LT/AT) are running
to keep a wake-up time base. All other peripherals
are not clocked except those which get their clock
supply from another clock generator (such as ex-
ternal or auxiliary oscillator).
Note: As soon as ACTIVE-HALT is enabled, exe-
cuting a HALT instruction while the Watchdog is
active does not generate a RESET.
This means that the device cannot spend more
than a defined delay in this power saving mode.
LTCSR1
TB1IE bit
ATCSR
OVFIE
bit
ATCSR
CK1 bit
ATCSR
CK0 bit
Meaning
0x
x
0
ACTIVE-HALT
mode disabled
00
x
1x
x
ACTIVE-HALT
mode enabled
x1
0
1
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相关代理商/技术参数
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