MC68340 datasheet(136/441 Pages) FREESCALE

136 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

4- 39

***************************************************************************

* Initialization code

***************************************************************************

* Start Chip Select Initialization:

INIT340

MOVE.W

#$2700,SR

Init SR - interrupts masked

***************************************************************************

* Set up default module base address value

MOVEQ.L

#7,D0

MBAR is in CPU space

MOVEC.L

D0,DFC

load DFC to indicate CPU space

MOVE.L

#MODBASE+1,D0

Set address/valid bit

MOVES.L

D0,MBAR

write to MBAR

***************************************************************************

* Set up system protection register:

* Software watchdog disabled, double bus fault monitor disabled, bus

* monitor

BERR after 16 clocks.

MOVE.B

#6,SYPCR+MODBASE

***************************************************************************

* Clock synthesizer control register:

* Switch from 8.3 to 16.7 MHZ

MOVE.W

#$7F00,SYNCR+MODBASE

X-bit doubles the default speed

***************************************************************************

* Module configuration register:

* When FREEZE is asserted, software watchdog and periodic interrupt timer

* are disabled, bus monitor is enabled. Port B = 4 IRQs, 4 chip selects.

* Show Cycles enabled, external arbitration enabled. Supervisor/user

* SIM registers unrestricted, Interrupt Arbitration at priority $F

MOVE.W

#$420F,MCR+MODBASE

***************************************************************************

* Now, set up Address masks and base addresses for the chip selects:

LEA

CSAM0+MODBASE,A0

Point to

CS0 addr. mask location.

MOVEQ

#7,D

Set up a loop counter.

LEA

CSAM0$,A1

Point to addr mask memory location.

LOOP

MOVE.L

(A1)+,(A0)+

Init. addr mask and base addr reg

DBRA

D0,LOOP

Freescale Semiconductor, Inc.

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