Freescale Semiconductor, Inc.
Operand Data:
None
Result Data:
Requested data is returned as either a word or long word. Byte data is returned in the
least significant byte of a word result. Word results return 16 bits of significant data;
long-word results return 32 bits. Status of the read operation is returned as in the READ
command: $0xxxx for success, $10001 for bus or address errors.
5.6.2.8.11 Fill Memory Block (FILL). FILL is used in conjunction with the WRITE
command to fill large blocks of memory. An initial WRITE is executed to set up the starting
address of the block and to supply the first operand. Subsequent operands are written
with the FILL command. The initial address is incremented by the operand size (1, 2, or 4)
and is saved in a temporary register. Subsequent FILL commands use this address,
increment it by the current operand size, and store the updated address back in the
temporary register.
NOTE
The FILL command does not check for a valid address in the
temporary register—FILL is a valid command only when
preceded by another FILL or by a WRITE command.
Otherwise, the results are undefined. The NOP command can
be used for intercommand padding without corrupting the
address pointer.
The size field is examined each time a FILL command is given, allowing the operand size
to be altered dynamically.
Command Format:
15
0
14
0
13
0
12
1
11
1
10
1
9
0
8
0
7
6
5
0
4
0
3
0
2
0
1
0
0
0
OP SIZE
5- 82
MC68340 USER’S MANUAL
MOTOROLA
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