MAC7200 datasheet(518/976 Pages) FREESCALE

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CRG Bus Aborts

MAC7200 Microcontroller Family Reference Manual, Rev. 2

440

Freescale Semiconductor

23.4.6.2

PLL Lock Interrupt

The CRG generates a PLL Lock interrupt when the LOCK condition of the PLL has changed, either from

a locked state to an unlocked state or vice versa. Lock interrupts are locally disabled by clearing the

LOCKIE bit to zero. The PLL Lock interrupt flag (LOCKIF) is set to 1 when the LOCK condition has

changed and is cleared to 0 by writing a 1 to the LOCKIF bit.

23.4.6.3

Self Clock Mode Interrupt

The CRG generates a Self Clock Mode interrupt when the SCM condition of the system has changed;

either entered or exited Self Clock Mode. SCM conditions can only change if the Clock Monitor Reset

Disable (CMRD) bit is set to 1. SCM conditions are caused by a failing clock quality check after power

on reset (POR) or low voltage reset (LVR) or Clock Monitor failure. For details on the clock quality check,

refer to Section 23.4.2.4, “Clock Quality Checker.” If the clock monitor is enabled (CME=1) a loss of

external clock will also cause a SCM condition (CMRD=1).

SCM interrupts are disabled locally by setting the SCMIE bit to zero. The SCM interrupt flag (SCMIF) is

set to1 when the SCM condition has changed, and is cleared to 0 by writing a 1 to the SCMIF bit.

23.5

CRG Bus Aborts

The CRG module supports Peripheral Bus bus aborts, and enforces the following memory map:

Supervisor Access: Unused.

23.6

CRG Differences from MAC71xx

•

Fixed MUCts01648: Write on bus abort still writes the register

•

Added single register with all possible reset sources

— Added the ILR, JTR, SFR, CMR, EXR and WDR bits to the CTFLG register

•

Removed Pseudo-STOP/STOP modes (DOZE still implemented)

— Removed the STPEF bit from the CRGFLG register

— Removed the PSTP bit from the CLKSEL register

Table 23-15. CRG Interrupt Vectors

Interrupt Source

CCR

Mask

Local Enable

LOCK interrupt

I bit

CRGINT (LOCKIE)

SCM interrupt

I bit

CRGINT (SCMIE)

Table 23-16. CRG Bus Aborts

Abort

Allowed

$0000-$000b

$000c-$3fff

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