DEMO9S12XEP100 Freescale Semiconductor, DEMO9S12XEP100 Datasheet - Page 260

• Manufacturer Part Number: DEMO9S12XEP100
• Description: BOARD DEMO FOR MC9S12XEP100
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S12XEP100

• Contents: Board, Cables, CD
• Processor To Be Evaluated: MC9S12XEP100
• Data Bus Width: 16 bit
• Interface Type: RS-232
• Silicon Manufacturer: Freescale
• Core Architecture: S12
• Core Sub-architecture: S12
• Silicon Core Number: MC9S12
• Silicon Family Name: S12XE
• Rohs Compliant: Yes
• For Use With/related Products: MC9S12XEP100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 5 External Bus Interface (S12XEBIV4)
5.4.6
The XEBI does not support any user-controlled options for reducing power consumption.
5.4.6.1
The XEBI does not support any options for reducing power in run mode.
Power consumption is reduced in single-chip modes due to the absence of the external bus interface.
Operation in expanded modes results in a higher power consumption, however any unnecessary toggling
of external bus signals is reduced to the lowest indispensable activity by holding the previous states
between external accesses.
5.4.6.2
The XEBI does not support any options for reducing power in wait mode.
5.4.6.3
The XEBI will cease to function in stop mode.
5.5
This section describes the external bus interface usage and timing. Typical customer operating modes are
normal expanded mode and emulation modes, specifically to be used in emulator applications. Taking the
availability of the external wait feature into account the use cases are divided into four scenarios:
Normal single-chip mode and special single-chip mode do not have an external bus. Special test mode is
used for factory test only. Therefore, these modes are omitted here.
All timing diagrams referred to throughout this section are available in the Electrical Characteristics
appendix of the SoC section.
5.5.1
This mode allows interfacing to external memories or peripherals which are available in the commercial
market. In these applications the normal bus operation requires a minimum of 1 cycle stretch for each
external access.
260
Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers
indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010
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Normal expanded mode
— External wait feature disabled
– External wait feature enabled
Emulation modes
– Emulation single-chip mode (without wait states)
– Emulation expanded mode (with optional access stretching)
Initialization/Application Information
Low-Power Options
Normal Expanded Mode
Run Mode
Wait Mode
Stop Mode
MC9S12XE-Family Reference Manual , Rev. 1.23
Freescale Semiconductor