Motorola once sc140 User Manual

14

Introduction to the SC140 Tools

The following instructions require data to be aligned on the specified boundaries:

1. Open the 

Ex4.c

 file, which contains a series of assembly instructions within a C framework using 

asm statements. For alternative (and nicer) ways of incorporating assembly code, consult the SC100 
C/C++ Compiler User’s Manual.

2. Look at the assembly instructions to understand the wide data move instructions. Notice that the code 

comprises two sections: the first section with aligned data and the second with non-aligned data.

3. For each instruction, write the result you expect from each section in the boxes provided here (in the 

Expected Columns). Array “data[ ]” is of type long int and therefore aligns on a 4-byte boundary.

move.w (r0),d0 

2-byte boundary

move.f (r0),d0

2-byte boundary

move.2w

(r0), d0:d1

4-byte boundary

move.2f

(r0), d0:d1

4-byte boundary

move.4w

(r0),d0:d1:d2:d3

8-byte boundary

move.4f

(r0),d0:d1:d2:d3

8-byte boundary

move.l

(r0),d0

8-byte boundary

move.2l

(r0),d0:d1

8-byte boundary

move #data,r0

move.w (r0),d0

move.2w (r0),d0:d1

move.2f (r0),d2:d3

move.4w (r0),d4:d5:d6:d7 

move.2l (r0),d8:d9 

r0

d0

d0

d1

d2

d3

d4

d5

d6

d7

d8

d9

Expected

Simulator

data:

0x01

0x231

0x45

0x67

0x89

0xAB

0xCD

0xEF

0xAA

0xBB

0xCC

0xDD

0xEE

0xFF 0x11

 

0x22

0100

0000

00