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ST6200LD6 View Datasheet(PDF) - STMicroelectronics

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ST6200LD6 Datasheet PDF : 100 Pages
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ST6200C ST6201C ST6203C
6.3 STOP MODE
STOP mode is the lowest power consumption
mode of the MCU (see Figure 22).
The MCU goes into STOP mode as soon as the
STOP instruction is executed. This has the follow-
ing effects:
– Program execution is stopped, the microcontrol-
ler can be considered as being “frozen”.
– The contents of RAM and the peripheral regis-
ters are kept safely as long as the power supply
voltage is higher than the RAM retention voltage.
– The oscillator is stopped, so peripherals cannot
work except the those that can be driven by an
external clock.
Exit from STOP Mode
The MCU remains in STOP mode until one of the
following events occurs:
– RESET (Watchdog, LVD or RESET pin)
– A peripheral interrupt (assuming this peripheral
can be driven by an external clock)
– An external interrupt (I/O port, NMI)
In all cases a delay of 2048 clock cycles (fINT) is
generated to make sure the oscillator has started
properly.
The Program Counter then points to the starting
address of the interrupt or RESET service routine
(see Figure 21).
STOP Mode and Watchdog
When the Watchdog is active (hardware or soft-
ware activation), the STOP instruction is disabled
and a WAIT instruction will be executed in its place
unless the EXCTNL option bit is set to 1 in the op-
tion bytes and a a high level is present on the NMI
pin. In this case, the STOP instruction will be exe-
cuted and the Watchdog will be frozen.
Figure 21. STOP Mode Timing Overview
RUN STOP
2048
CLOCK CYCLE
DELAY
RUN
STOP
INSTRUCTION
RESET
OR
INTERRUPT
FETCH
VECTOR
Doc ID 4563 Rev 5
33/100
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