MC68HC05V12 Datasheet, PDF (75/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05V12
Section 6. Low-Power Modes
6.1 Contents
6.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
6.3 STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
6.4 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
6.5 WAIT Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
6.2 Introduction
The MC68HC705V12 is capable of running in one of several low-power
operational modes. The WAIT and STOP instructions provide two
modes that reduce the power required for the MCU by stopping various
internal clocks and/or the on-chip oscillator. The STOP and WAIT
instructions are not normally used if the computer operating properly
(COP) watchdog timer is enabled. A programmable mask option is
provided to convert the STOP instruction to an internal reset. The flow of
stop mode and wait mode is shown in Figure 6-2.
6.3 STOP Instruction
The STOP instruction can result in one of two operations depending on
the state of the mask option:
• If the STOP option is enabled, the STOP instruction operates like
the STOP in normal M68HC05 Family members and places the
device in the low-power stop mode.
• If the STOP option is disabled, the STOP instruction will cause a
chip reset when executed.
MC68HC05V12 — Rev. 2.0
Low-Power Modes
For More Information On This Product,
Go to: www.freescale.com
Technical Data