MC9S12XD256MAL Datasheet, PDF (1155/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)
7
6
5
4
3
2
1
0
R
Undefined
0
0
0
0
CBEIE
CCIE
KEYACC
W
Reset
0
0
0
Undefined
0
0
0
0
= Unimplemented or Reserved
Figure 28-8. Flash Configuration Register (FCNFG — Normal Mode)
7
6
5
4
3
2
1
0
R
0
0
0
0
CBEIE
CCIE
KEYACC
BKSEL
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 28-9. Flash Configuration Register (FCNFG — Special Mode)
CBEIE, CCIE and KEYACC bits are readable and writable while all remaining bits read 0 and are not
writable in normal mode. KEYACC is only writable if KEYEN (see Section 28.3.2.2, “Flash Security
Register (FSEC)” is set to the enabled state. BKSEL is readable and writable in special mode to simplify
mass erase and erase verify operations. When writing to the FCNFG register in special mode, all
unimplemented/ reserved bits must be written to 0.
Table 28-8. FCNFG Field Descriptions
Field
7
CBEIE
6
CCIE
5
KEYACC
0
BKSEL
Description
Command Buffer Empty Interrupt Enable — The CBEIE bit enables an interrupt in case of an empty command
buffer in the Flash module.
0 Command buffer empty interrupt disabled.
1 An interrupt will be requested whenever the CBEIF flag (see Section 28.3.2.6, “Flash Status Register
(FSTAT)”) is set.
Command Complete Interrupt Enable — The CCIE bit enables an interrupt in case all commands have been
completed in the Flash module.
0 Command complete interrupt disabled.
1 An interrupt will be requested whenever the CCIF flag (see Section 28.3.2.6, “Flash Status Register (FSTAT)”)
is set.
Enable Security Key Writing
0 Flash writes are interpreted as the start of a command write sequence.
1 Writes to Flash array are interpreted as keys to open the backdoor. Reads of the Flash array return invalid
data.
Block Select — The BKSEL bit indicates which register bank is active.
0 Select register bank associated with Flash block 0.
1 Select register bank associated with Flash block 1.
28.3.2.5 Flash Protection Register (FPROT)
The FPROT register defines which Flash sectors are protected against program or erase operations.
Freescale Semiconductor
MC9S12XDP512 Data Sheet, Rev. 2.21
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