mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 279

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

12.2.4 Accumulator Extension Registers (ACCext01, ACCext23)
Each pair of 8-bit accumulator extension fields are concatenated with the corresponding
32-bit accumulator register to form the 48-bit accumulator. For more information, see the
functional description.
Freescale Semiconductor, Inc.
ACC0U
ACC1U
ACC0L
ACC1L
31–24
23–16
15–8
Field
7–0
Reset
Reset
Reset
BDM:
BDM:
W
W
W
R
R
R
Accumulator 0 upper extension byte
Accumulator 0 lower extension byte
Accumulator 1 upper extension byte
Accumulator 1 lower extension byte
Description
31
15
31
15
–
–
–
30
14
Table 12-11. Accumulator Extension Register (ACCext23)
30
14
Table 12-9. Accumulator Extension Register (ACCext01)
–
–
–
29
13
29
13
–
–
–
Table 12-10. ACCext01 Field Descriptions
MCF51JF128 Reference Manual, Rev. 2, 03/2011
28
12
28
12
–
–
–
ACC0U
ACC1U
ACC2U
Read: 0xE7 (ACCext01)
Read: 0xE8 (ACCext01)
27
11
27
11
–
–
–
Table continues on the next page...
Write: 0xC7
Write: 0xC8
26
10
26
10
–
–
–
Preliminary
25
25
–
9
–
–
9
24
24
–
8
–
–
8
Chapter 12 Enhanced Multiply-Accumulate Unit (EMAC)
23
23
–
7
–
–
7
22
22
–
6
–
–
6
21
21
–
5
–
–
5
20
20
–
4
–
–
4
ACC0L
ACC1L
ACC2L
Access: User read/write
Access: User read/write
19
19
–
3
–
–
3
BDM read/write
BDM read/write
18
18
–
2
–
–
2
17
17
–
1
–
–
1
16
16
–
0
–
–
0
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