Motorola MC68340 Sspinit EQU, Mbar EQU, Modbase EQU $FFFFF000, Mcr Equ, Syncr EQU, Sypcr EQU

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

4.4.3 SIM40 Example Configuration Code

The following code is an example configuration sequence for the SIM40 module.

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

*MC68340 basic SIM40 register initialization example code:

*This code is used to initialize the MC68340's internal SIM40 registers,

*providing basic functions for operation.

*It includes chip select programming for external devices.

*This code would be programmed beginning at offset $0 into ROM which is

*relocated to address $60000 by the initialization code.

*The SSP_VEC and RST_VEC vectors used to initialize the system stack

*pointer and initial PC, respectively, are located at offset $0 after

*reset.

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

*equates

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

SSP_INIT	EQU	$10000	Stack pointer initial value - top of RAM
MBAR	EQU	$0003FF00	Address of Module Base Address Reg.
MODBASE	EQU	$FFFFF000	Default Module Base address value

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

* SIM40 register offsets from MBAR base address

MCR	EQU	$00
SYNCR	EQU	$04
SYPCR	EQU	$21
CSAM0	EQU	$40
CSBAR0	EQU	$44
CSAM1	EQU	$48
CSBAR1	EQU	$4c
CSAM2	EQU	$50
CSBAR2	EQU	$54
CSAM3	EQU	$58
CSBAR3	EQU	$5c

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

*Reset vectors

*These two vectors should be located at addresses $0 and $4 after a processor

*hardware reset.

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

ORG $60000

SSP_VEC	DC.L	SSP_INIT	Supervisor stack pointer - initial value
RST_VEC	DC.L	INIT340	Reset vector pointing to initialization code

4- 38MC68340 USER’S MANUALMOTOROLA

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