MC9S08LG32 MCU Series, Rev. 5
Freescale Semiconductor
41
Chapter 3
Modes of Operation
3.1
Introduction
This chapter describes the operating modes of the MC9S08LG32 series. It also describes entry, exit, and
the functionality of each mode.
3.2
Features
•
Active background mode for code development.
•
Run mode — CPU clocks can be run at full speed and the internal supply is fully regulated.
•
Wait mode — CPU shuts down to conserve power; system clocks are running and full regulation
is maintained.
•
Stop modes — System clocks are stopped and voltage regulator is in standby.
— Stop3 — All internal circuits are powered for fast recovery.
— Stop2 — Partial power down of internal circuits, RAM content is retained, and the I/O states
are held.
3.3
Run Mode
This is the normal operating mode for the MC9S08LG32 series. In this mode, the CPU executes code from
internal memory with execution beginning at the address fetched from memory at 0xFFFE–0xFFFF after
reset.
3.4
Active Background Mode
The active background mode functions are managed through the BDC in the HCS08 core. The BDC and
the on-chip debug module (DBG), provide the means for analyzing MCU operation during software
development.
Active background mode is entered by any of six methods:
•
When the BKGD/MS pin is low during POR
•
When the BKGD/MS pin is low immediately after issuing a background debug force reset (for
more information, see
Section 5.8.3, “System Background Debug Force Reset Register (SBDFR)
”)
•
When a BACKGROUND command is received through the BKGD/MS pin
•
When a BGND instruction is executed
•
When encountering a BDC breakpoint
Summary of Contents for MC9S08LG16
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