Motorola MCF5282, MCF5281 Read Control Register Rcreg, Rc encoding, Control Register Map

Background Debug Mode (BDM)

29.5.3.3.9 Read Control Register (RCREG)

Reads the selected control register and returns the 32-bit result. Accesses to the processor/memory control registers are always 32 bits wide, regardless of register width. The second and third words of the command form a 32-bit address, which the debug module uses to generate a special bus cycle to access the specified control register. The 12-bit Rc field is the same as that used by the MOVEC instruction.

Command/Result Formats:

15	12	11	8	7	4	3	0
Command	0x2		0x9	0x8			0x0
	0x0		0x0	0x0			0x0
	0x0			Rc
Result			D[31:16]
			D[15:0]

Figure 29-33. RCREG Command/Result Formats

Rc encoding:

	Table 29-19. Control Register Map
Rc		Register Definition
0x002		Cache Control Register (CACR)
0x004		Access Control Register (ACR0)
0x005		Access Control Register (ACR1)
0x800		Other Stack Pointer (OTHER_A7)
0x801		Vector Base Register (VBR)
0x804		MAC Status Register (MACSR)
0x805		MAC Mask Register (MASK)
0x806		MAC Accumulator 0 (ACC0)
0x807		MAC Accumulator 0,1 Extension Bytes (ACCEXT01)
0x808		MAC Accumulator 2,3 Extension Bytes (ACCEXT23)
0x809		MAC Accumulator 1 (ACC1)
0x80A		MAC Accumulator 2 (ACC2)
0x80B		MAC Accumulator 3 (ACC3)
0x80E		Status Register (SR)
0x80F		Program Register (PC)
0xC04		Flash Base Address Register 0 (FLASHBAR)
0xC05		RAM Base Address Register (RAMBAR)

29-32 MCF5282 User’s Manual MOTOROLA