DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 31

• Manufacturer Part Number: DEMO9S08EL32
• Description: BOARD DEMO FOR 9S08 EL MCU
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08EL32

• Contents: Evaluation Board
• Processor To Be Evaluated: MC9S08EL32
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 12 V
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08EL
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08EL32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 3
Modes of Operation
3.1
The operating modes of the MC9S08EL32 Series and MC9S08SL16 Series are described in this chapter.
Entry into each mode, exit from each mode, and functionality while in each of the modes is described.
3.2
3.3
This is the normal operating mode for the MC9S08EL32 Series and MC9S08SL16 Series. 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.
3.4
The active background mode functions are managed through the background debug controller (BDC) in
the HCS08 core. The BDC, together with the on-chip debug module (DBG), provide the means for
analyzing MCU operation during software development.
Active background mode is entered in any of five ways:
After entering active background mode, the CPU is held in a suspended state waiting for serial background
commands rather than executing instructions from the user application program.
Freescale Semiconductor
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Active background mode for code development
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; RAM and register contents are
— Stop2 — Partial power down of internal circuits; RAM content is retained
When the BKGD/MS pin is low at the rising edge of reset
When a BACKGROUND command is received through the BKGD/MS pin
When a BGND instruction is executed
When encountering a BDC breakpoint
When encountering a DBG breakpoint
Introduction
Features
Run Mode
Active Background Mode
retained
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
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