mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1117

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

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
Register (FSEC)”
mass erase and erase verify operations. When writing to the FCNFG register in special mode, all
unimplemented/ reserved bits must be written to 0.
Freescale Semiconductor
BKSEL[1:0]
KEYACC
Reset
Reset
CBEIE
Field
CCIE
1–0
7
6
5
W
W
R
R
CBEIE
CBEIE
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
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
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
Block Select — The BKSEL[1:0] bits indicates which register bank is active according to
0
0
7
7
(FSTAT)”)
is set.
data.
is set to the enabled state. BKSEL is readable and writable in special mode to simplify
Figure 27-8. Flash Configuration Register (FCNFG — Normal Mode)
Figure 27-9. Flash Configuration Register (FCNFG — Special Mode)
= Unimplemented or Reserved
= Unimplemented or Reserved
is set.
CCIE
CCIE
0
0
6
6
Table 27-10. Flash Register Bank Selects
BKSEL[1:0]
Table 27-9. FCNFG Field Descriptions
KEYACC
KEYACC
MC9S12XDP512 Data Sheet, Rev. 2.17
00
01
0
0
5
5
0
0
0
0
4
4
Description
Selected Block
Flash Block 0
Flash Block 1
Chapter 27 512 Kbyte Flash Module (S12XFTX512K4V2)
0
0
0
0
3
3
Section 27.3.2.6, “Flash Status Register
Section 27.3.2.6, “Flash Status Register
Section 27.3.2.2, “Flash Security
0
0
0
0
2
2
0
0
0
1
1
Table
BKSEL
27-10.
(FSTAT)”)
0
0
0
0
0
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