MOTOROLA
Chapter 21. CDR3 Flash (UC3F) EEPROM
21-11
Programming Model
6:7
SBPROTECT Small block protect. Each small block of the UC3F EEPROM can be individually protected from
program or erase operation. The UC3F will perform all program and erase interlocks and even
complete the program or erase sequence, but the program and erase voltages are not applied
to locations within the protected small block(s).
0 small block M is unprotected
1 small block M is protected
8:9
—
Reserved
10:15
BIU
BIU configuration bits. These register bits are reserved for BIU functionality and are strictly
outputs from the UC3F EEPROM.
16:18
MEMSIZ
Memory size. The MEMSIZ field is used to indicate the UC3F array size. The MEMSIZ bits are
read only and writes have no effect.
000
UC3F array is 64 Kbytes
001
UC3F array is 128 Kbytes
010
UC3F array is 192 Kbytes
011
UC3F array is 256 Kbytes
100
unused
101
UC3F array is 512 Kbytes
110
unused
111
unused
The Flash module on the MPC563 is 512 Kbytes.
19
BLK
Block size. The BLK bit is used to indicate the array block size used in the UC3F array. The BLK
bit is read only and writes have no effect.
0 array block size is 32 Kbytes
1 block size is 64 Kbytes NOTE: All blocks are 64 Kbytes (i.e. BLK is always set)
20
MAP
Array address mapping. The MAP bit is used to indicate the UC3F array address mapping within
a 2N address space. The MAP bit is read only and writes have no effect. The MAP bit is more
useful when the UC3F array is a non-2N size.
When MAP = 0, the UC3F array is mapped to the bottom (starting at address 0) of the 2N space
in which the array resides. For modules with 2N array sizes, the MAP bit is always set to 0.
When MAP = 1, the UC3F array is mapped to the top (ending at address all $F’s) of the 2N space
in which the array resides.
0 UC3F array is mapped to bottom of 2N address space
1 UC3F array is mapped to top of 2N address space
21:22
SBLKL
Small block location code. There are three possible locations for the small blocks: 1) a small
block may be placed in the lowest numbered host block and the highest numbered host blocks,
2) a small block may be placed in the lowest numbered host block and the second lowest
numbered host block, and 3) a small block may be placed in the second highest numbered host
block and the highest numbered host block.
00 unused
01 small blocks are part of the two highest numbered blocks of the UC3F array
10 small blocks are part of the two lowest numbered blocks of the UC3F array
11 small blocks are part of the lowest and highest numbered blocks of the UC3F array
23:31
FLASHID
Flash module identification code. The FLASHID value is assigned by Motorola and used
internally for tracking purposes. The FLASHID field is read only and writes have no effect.
Table 21-4. UC3FMCRE Bit Descriptions (continued)
Bits
Name
Description