Motorola ColdFire MCF5281 - Manual (Page 154)

System Control Module (SCM)
8-2 Freescale Semiconductor
8.3 Memory Map and Register Definition
The memory map for the SCM registers is shown in Table 8-1 . All the registers in the SCM are
memory-mapped as offsets within the 1 Gbyte IPS address space and accesses are controlled to these
registers by the control definitions programmed into the SACU.
8.4 Register Descriptions
8.4.1 Internal Peripheral System Base Address Register (IPSBAR)
The IPSBAR specifies the base address for the 1 Gbyte memory space associated with the on-chip
peripherals. At reset, the base address is loaded with a default location of 0x4000_0000 and marked as
valid (IPSBAR[V]=1). If desired, the address space associated with the internal modules can be moved by
loading a different value into the IPSBAR at a later time.
NOTE
Accessing reserved IPSBAR memory space could result in an unterminated
bus cycle that causes the core to hang. Only a hard reset will allow the core
to recover from this state. Therefore, all bus accesses to IPSBAR space
should fall within a module’s memory map space.
If an address “hits” in overlapping memory regions, the following priority is used to determine what
memory is accessed:
1. IPSBAR
2. RAMBAR
3. Cache
4. SDRAM
Table 8-1. SCM Register Map
IPSBAR
Offset
[31:24] [23:16] [15:8] [7:0]
0x00_0000 IPSBAR
0x00_0004 —
0x00_0008 RAMBAR
0x00_000C —
0x00_0010 CRSR CWCR LPICR
1
1 The LPICR is described in Chapter 7, “Power Management ."
CWSR
0x00_0018 —
0x00_001C MPARK
0x00_0020 MPR —
0x00_0024 PACR0 PACR1 PACR2 PACR3
0x00_0028 PACR4 — PACR5 PACR6
0x00_002c PACR7 — PACR8 —
0x00_0030 GPACR0 GPACR1 — —
0x00_0034 — — — —
0x00_0038 — — — —
0x00_003C — — — —
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3