Motorola ColdFire MCF5281 - Manual (Page 49)

ColdFire Core
Freescale Semiconductor 2-3
Accumulators and extension bytes can be loaded, copied, and stored, and results from EMAC
arithmetic operations generally affect the entire 48-bit destination.
— One 16-bit mask register (MASK)
— One 32-bit Status register (MACSR) including four indicator bits signaling product or
accumulation overflow (one for each accumulator: PAV0–PAV3)
The supervisor programming model is to be used only by system control software to implement restricted
operating system functions, I/O control, and memory management. All accesses that affect the control
features of ColdFire processors are in the supervisor programming model, which consists of registers
available in user mode as well as the following control registers:
• 16-bit status register (SR)
• 32-bit supervisor stack pointer (SSP)
• 32-bit vector base register (VBR)
• 32-bit cache control register (CACR)
• 32-bit access control registers (ACR0, ACR1)
Table 2-1. ColdFire Core Programming Model
BDM 1 Register
Width
(bits)
Access Reset Value
Written with
MOVEC
Section/Page
Supervisor/User Access Registers
Load: 0x080
Store: 0x180
Data Register 0 (D0) 32 R/W 0xCF20_6080 No 2.2.1/2-4
Load: 0x081
Store: 0x181
Data Register 1 (D1) 32 R/W 0x13B0_1080 No 2.2.1/2-4
Load: 0x082–7
Store: 0x182–7
Data Register 2–7 (D2–D7) 32 R/W Undefined No 2.2.1/2-4
Load: 0x088–8E
Store: 0x188–8E
Address Register 0–6 (A0–A6) 32 R/W Undefined No 2.2.2/2-4
Load: 0x08F
Store: 0x18F
Supervisor/User A7 Stack Pointer (A7) 32 R/W Undefined No 2.2.3/2-5
0x804 MAC Status Register (MACSR) 32 R/W 0x0000_0000 No 3.2.1/3-3
0x805 MAC Address Mask Register (MASK) 32 R/W 0xFFFF_FFFF No 3.2.2/3-5
0x806, 0x809,
0x80A, 0x80B MAC Accumulators 0–3 (ACC0–3) 32 R/W Undefined No 3.2.3/3-6
0x807 MAC Accumulator 0,1 Extension Bytes
(ACCext01) 32 R/W Undefined No 3.2.4/3-7
0x808 MAC Accumulator 2,3 Extension Bytes
(ACCext23) 32 R/W Undefined No 3.2.4/3-7
0x80E Condition Code Register (CCR) 8 R/W Undefined No 2.2.4/2-6
• Two 32-bit memory base address registers (RAMBAR, FLASHBAR)
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3