S12MSCANV2SLASHD datasheet(41/98 Pages) NXP

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MC9S12KG128 SoC Guide — V01.01

Section 4 Modes of Operation

4.1 Overview

Eight possible modes determine the operating configuration of the MC9S12KG128. Each mode has an

associated default memory map and external bus configuration.. In addition each operating mode, with the

exception of Special Peripheral Mode(SPM), can be configured for low power operation by entering one

of three low power sub-modes. The device is also equipped with security features which restrict certain

modes of operation and limit access to internal memory. More detailed information on the various

operating modes, and their configurations can be found in the HCS12 Core User Guide.

4.2 Modes of Operation

There are two basic categories of operating modes:

Normal modes: Some registers and bits are protected against accidental changes.

Special modes: Allow greater access to protected control registers and bits for special purposes such

as testing.

In all Normal and Special modes a system development and debug feature, background debug mode

(BDM), is available. In special single-chip mode, BDM is active immediately after reset.

The operating mode out of reset is determined by the states of the MODC, MODB, and MODA pins during

reset (Table 4-1). The MODC, MODB, and MODA bits in the MODE register show the current operating

mode and provide limited mode switching during operation. The states of the MODC, MODB, and MODA

pins are latched into these bits on the rising edge of the reset signal. The MODA and MODB pins are not

available in the 80 pin package versions and are pulled down internally, restricting the mode selection out

of reset to Single Chip Modes. When reseting into all modes except SPM, the ESTR bit in the EBICTL

fetched even if it located in an external slow memory device.

Table 4-1 Mode Selection

MODC

MODB

MODA

Mode Description

Notes

000

Special Single Chip, BDM allowed and ACTIVE. BDM is allowed in all

other modes but a serial command is required to make BDM active.

Available in all

package versions

Emulation Expanded Narrow, BDM allowed

Only available in

112 LQFP

Special Test (Expanded Wide), BDM allowed

Only available in

112 LQFP

Emulation Expanded Wide, BDM allowed

Only available in

112 LQFP

Normal Single Chip, BDM allowed

Available in all

package versions

Normal Expanded Narrow, BDM allowed

Only available in

112 LQFP

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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