mc9s08gt16a Freescale Semiconductor, Inc, mc9s08gt16a Datasheet - Page 33
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mc9s08gt16a
Manufacturer Part Number
mc9s08gt16a
Description
Hcs08 Microcontrollers 8-bit Microcontroller Family
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08GT16A.pdf
(300 pages)
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Chapter 3
Modes of Operation
3.1
The operating modes of the MC9S08GT16A/GT8A are described in this section. Entry into each mode,
exit from each mode, and functionality while in each of the modes are described.
3.1.1
3.2
This is the normal operating mode for the MC9S08GT16A/GT8A. This mode is selected when the
BKGD/MS pin is high at the rising edge of reset. In this mode, the CPU executes code from internal
memory with execution beginning at the address fetched from memory at 0xFFFE:0xFFFF after reset.
3.3
The active background mode functions are managed through the background debug controller (BDC) in
the HCS08 core. The BDC, together with the on-chip ICE debug module (DBG), provide the means for
analyzing MCU operation during software development.
Active background mode is entered in any of five ways:
Freescale Semiconductor
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Active background mode for code development
Wait mode:
— CPU shuts down to conserve power
— System clocks running
— Full voltage regulation maintained
Stop modes:
— Stop1 — Full power down of internal circuits for maximum power savings
— Stop2 — Partial power down of internal circuits, RAM contents retained
— Stop3 — All internal circuits powered for fast recovery
When the BKGD/MS pin is low at the rising edge of reset
When a BACKGROUND command is received through the BKGD pin
When a BGND instruction is executed
When encountering a BDC breakpoint
When encountering a DBG breakpoint
Introduction
Run Mode
Active Background Mode
Features
MC9S08GT16A/GT8A Data Sheet, Rev. 1
33
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