Motorola MPC533 Reference Manual page 840

UC3F Operation
Bits Name
1
21 EN_COMP Enable compression — This bit enables the operation of the MPC534 with compressed code.
See Table 4-4.
1
22 EXC_COMP Exception compression — This bit determines the operation of the MPC534 with exceptions.
0 indicates the exceptions are all non-compressed. See Table 4-4.
1 the MPC534 assumes that ALL the exception routines are in compressed code.
23 — Reserved. This bit must be programmed low in the reset configuration word.
24:25 OERC Other exceptions relocation control — These bits effect only if ETRE was enabled.
Relocation offset:
00 Offset 0
01 Offset 64 Kbytes
10 Offset 512 Kbytes
11 Offset to 0x003F E000
See Table 4-2.
26:27 — Reserved
28:30 ISB Internal space base select — This field defines the initial value of the ISB field in the IMMR
register. A detailed description is in Table 6-12. The default state is that the internal memory map
is mapped to start at address 0x0000_0000. This bit must not be high in the reset configuration
word.
31 DME Dual mapping enable — This bit determines whether Dual mapping of the internal Flash is
enabled. For a detailed description refer to Table 10-12. The default state is that dual mapping is
disabled.
0 Dual mapping disabled
1 Dual mapping enabled
1
This bit is available only on the MPC534.
During reset, the has configuration bit (HC) and the USIU configure the UC3F EEPROM
module to provide UC3FCFIG. If HC = 0 and the USIU requests internal configuration
during reset the reset configuration word will be provided by UC3FCFIG.
The default reset state of the UC3FCFIG after an erase operation of the UC3F module is no
configuration word available (HC = 1).
19.2.4 UC3F EEPROM 512-Kbyte Array Configuration
Figure 19-7, the array configuration diagram, shows the UC3F configuration for the
MPC533 512-Kbyte arrays. The shaded blocks in Figure 19-7 indicate the location of the
shadow row.
19.3 UC3F Operation
The following sections describe the operation of the UC3F EEPROM during various
operational modes. The primary function of the UC3F EEPROM module is to serve as
19-18
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Table 19-6. RCW Bit Descriptions (continued)
Figure 19-7. 512-Kbyte Array Configuration
MPC533 Reference Manual
Description
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