HCS08 datasheet(85/290 Pages) MOTOROLA

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Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

MC9S08GB/GT

6.1.2 Modes of Operation

This is a high-level description only. Detailed descriptions of operating modes are contained in 6.3

Functional Description

•

Mode 1 — Off

The output clock, ICGOUT, is static. This mode may be entered when the STOP instruction is

executed.

•

Mode 2 — Self-clocked (SCM)

Default mode of operation that is entered out of reset. The ICG’s FLL is open loop and the digitally

controlled oscillator (DCO) is free running at a frequency set by the filter bits.

•

Mode 3 — FLL engaged internal (FEI)

In this mode, the ICG’s FLL is used to create frequencies that are programmable multiples of the

internal reference clock.

–

FLL engaged internal unlocked is a transition state which occurs while the FLL is attempting to

lock. The FLL DCO frequency is off target and the FLL is adjusting the DCO to match the target

frequency.

–

FLL engaged internal locked is a state which occurs when the FLL detects that the DCO is

locked to a multiple of the internal reference.

•

Mode 4 — FLL bypassed external (FBE)

In this mode, the ICG is configured to bypass the FLL and use an external clock as the clock source.

•

Mode 5 — FLL engaged external (FEE)

The ICG’s FLL is used to generate frequencies that are programmable multiples of the external

clock reference.

–

FLL engaged external unlocked is a transition state which occurs while the FLL is attempting

to lock. The FLL DCO frequency is off target and the FLL is adjusting the DCO to match the

target frequency.

–

FLL engaged external locked is a state which occurs when the FLL detects that the DCO is

locked to a multiple of the internal reference.

6.2 External Signal Description

6.2.1 Overview

Table 6-1 shows the user-accessible signals available for the ICG.

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