MC68340 datasheet(135/441 Pages) FREESCALE

135 / 441 page

4- 38

MC68340 USER’S MANUAL

MOTOROLA

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

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68340 датащи(PDF) 135 Page - Freescale Semiconductor, Inc

MC68340 датащи(HTML) 135 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL