mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1163

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

28.3.2.7
The FCMD register is the Flash command register.
All CMDB bits are readable and writable during a command write sequence while bit 7 reads 0 and is not
writable.
28.3.2.8
The FCTL register is the Flash control register.
All bits in the FCTL register are readable but are not writable.
The FCTL NV bits are loaded from the Flash nonvolatile byte located at global address 0x7F_FF0E during
the reset sequence, indicated by F in
Freescale Semiconductor
CMDB[6:0]
Reset
Reset
Field
6:0
W
W
R
R
Flash Command — Valid Flash commands are shown in
listed in
Flash Command Register (FCMD)
Flash Control Register (FCTL)
0
1
0
0
7
7
Table 28-16
= Unimplemented or Reserved
= Unimplemented or Reserved
NV6
1
F
6
6
Figure 28-14. Flash Command Register (FCMD)
sets the ACCERR flag in the FSTAT register.
Figure 28-15. Flash Control Register (FCTL)
Table 28-16. Valid Flash Command List
Table 28-15. FCMD Field Descriptions
CMDB[6:0]
MC9S12XDP512 Data Sheet, Rev. 2.17
0x05
0x06
0x20
0x40
0x41
0x47
NV5
Figure
F
0
5
5
28-15.
NV4
0
F
4
4
Sector Erase Abort
Description
NVM Command
Data Compress
Word Program
Sector Erase
Erase Verify
Mass Erase
CMDB
Table
NV3
Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)
F
0
3
3
28-16. Writing any command other than those
NV2
0
F
2
2
NV1
F
0
1
1
NV0
0
F
0
0
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