mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 85

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

3.2.4
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
Description.”
Freescale Semiconductor
Accumulator
ACC0U
ACC1U
ACC0L
ACC1L
31–24
23–16
Field
Field
31–0
15–8
7–0
Reset – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Reset – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
BDM: 0x806 (ACC0)
BDM: 0x807 (ACCext01)
W
W
R
R
Accumulator Extension Registers (ACCext01, ACCext23)
0x809 (ACC1)
0x80A (ACC2)
0x80B (ACC3)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
Store 32-bits of the result of the MAC operation.
Accumulator 0 upper extension byte
Accumulator 0 lower extension byte
Accumulator 1 upper extension byte
Accumulator 1 lower extension byte
ACC0U
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
Figure 3-5. Accumulator Extension Register (ACCext01)
Figure 3-4. Accumulator Registers (ACC0–3)
Table 3-6. ACCext01 Field Descriptions
Table 3-5. ACC0–3 Field Descriptions
ACC0L
Accumulator
Description
Description
ACC1U
Enhanced Multiply-Accumulate Unit (EMAC)
8
8
7
7
Section 3.3, “Functional
Access: User read/write
Access: User read/write
6
6
5
5
ACC1L
BDM read/write
BDM read/write
4
4
3
3
2
2
1
1
0
0
3-7