S912XEG384J3VA Datasheet, PDF (860/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

Chapter 24 128 KByte Flash Module (S12XFTM128K2V1)
Table 24-28. FECCR Index=000 Bit Descriptions
Field
Description
15:8
PAR[7:0]
ECC Parity Bits — Contains the 8 parity bits from the 72 bit wide P-Flash data word or the 6 parity bits,
allocated to PAR[5:0], from the 22 bit wide D-Flash word with PAR[7:6]=00.
7
XBUS01
Bus Source Identifier — The XBUS01 bit determines whether the ECC error was caused by a read access
from the CPU or XGATE.
0 ECC Error happened on the CPU access
1 ECC Error happened on the XGATE access
6–0
Global Address — The GADDR[22:16] field contains the upper seven bits of the global address having
GADDR[22:16] caused the error.
The P-Flash word addressed by ECCRIX = 001 contains the lower 16 bits of the global address. The
following four words addressed by ECCRIX = 010 to 101 contain the 64-bit wide data phrase. The four
data words and the parity byte are the uncorrected data read from the P-Flash block.
The D-Flash word addressed by ECCRIX = 001 contains the lower 16 bits of the global address. The
uncorrected 16-bit data word is addressed by ECCRIX = 010.
24.3.2.14 Flash Option Register (FOPT)
The FOPT register is the Flash option register.
Offset Module Base + 0x0010
7
6
5
4
3
2
1
0
R
NV[7:0]
W
Reset
F
F
F
F
F
F
F
F
= Unimplemented or Reserved
Figure 24-22. Flash Option Register (FOPT)
All bits in the FOPT register are readable but are not writable.
During the reset sequence, the FOPT register is loaded from the Flash nonvolatile byte in the Flash
configuration field at global address 0x7F_FF0E located in P-Flash memory (see Table 24-3) as indicated
by reset condition F in Figure 24-22. If a double bit fault is detected while reading the P-Flash phrase
containing the Flash nonvolatile byte during the reset sequence, all bits in the FOPT register will be set.
Table 24-29. FOPT Field Descriptions
Field
7–0
NV[7:0]
Description
Nonvolatile Bits — The NV[7:0] bits are available as nonvolatile bits. Refer to the device user guide for proper
use of the NV bits.
24.3.2.15 Flash Reserved0 Register (FRSV0)
This Flash register is reserved for factory testing.
MC9S12XE-Family Reference Manual Rev. 1.25
860
Freescale Semiconductor