Motorola ColdFire MCF5281 - Manual (Page 167)

System Control Module (SCM)
Freescale Semiconductor 8-15
At reset, these on-chip modules are configured to have only supervisor read/write access capabilities. If an
instruction fetch access to any of these peripheral modules is attempted, the IPS bus cycle is immediately
terminated with an error.
8.6.3.3 Grouped Peripheral Access Control Registers (GPACR0 & GPACR1)
The on-chip peripheral space starting at IPSBAR is subdivided into sixteen 64-Mbyte regions. Each of the
first two regions has a unique access control register associated with it. The other fourteen regions are in
reserved space; the access control registers for these regions are not implemented. Bits [29:26] of the
address select the specific GPACRn to be used for a given reference within the IPS address space. These
access control registers are 8 bits in width so that read, write, and execute attributes may be assigned to the
given IPS region.
NOTE
The access control for modules with memory space protected by
PACR0–PACR8 are determined by the PACR0–PACR8 settings. The access
control is not affected by GPACR0, even though the modules are mapped in
its 64-Mbyte address space.
0x027 PACR3 UART2 —
0x028 PACR4 I 2 C QSPI
0x029 — — —
0x02a PACR5 DTIM0 DTIM1
0x02b PACR6 DTIM2 DTIM3
0x02c PACR7 INTC0 INTC1
0x02d — — —
0x02e PACR8 FEC0 —
7 6–4 3 0
Field LOCK — ACCESS_CTRL
Reset 0000_0000
Read/Write R/W R R/W
Address IPSBAR + 0x030, IPSBAR + 0x31
Figure 8-10. Grouped Peripheral Access Control Register (GPACR)
Table 8-11. Peripheral Access Control Registers (PACRs) (continued)
IPSBAR Offset Name
Modules Controlled
ACCESS_CTRL1 ACCESS_CTRL0
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3