MC68HC05PV8 Datasheet, PDF (89/196 Pages) Freescale Semiconductor, Inc – Techinal Data - rev 1.9

Freescale Semiconductor, Inc.
Operating Modes
Low Power Modes
6.5.1.1 Ultra Low Power Mode
The Ultra Low Power Mode is only available on the 68HC05PV8A. It is
a submode to STOP mode. The ULPM bit in the Interrupt Control
Register influences the onchip analogue circuits. On setting the ULPM
bit, PC0 .. PC4 is forced to input state, PC5/6 is switched off, opamp is
debiased, downscaler, power supply and die temperature monitors are
disabled. It is mandatory to set the ULPM bit in the last instruction prior
to executing the STOP instruction and should be reset immediately after
recovering from stop to utilize the ultra low power mode. When the mcu
is stopped, the main voltage regulator is switched off and the mcu is
supplied by a standby regulator. On any interrupt or reset, the main
regulator is switched on again and the normal STOP mode recovery
procedure is started as soon as VDD has reached the low voltage reset
threshold.
6.5.2 STOP Recovery
The processor can be brought out of the STOP mode by an external
interrupt, an environmental exception interrupt, a walk-up interrupt or
RESET. See Figure 6-1.
MC68HC(8)05PV8/A — Rev. 1.9
Operating Modes
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Technical Data