PC312XDP512F0CFVR datasheet(1121/1348 Pages) FREESCALE

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Chapter 27 512 Kbyte Flash Module (S12XFTX512K4V2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

1123

27.3.2.7

Flash Command Register (FCMD)

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.

27.3.2.8

Flash Control Register (FCTL)

The FCTL register is the Flash control register.

All bits in the FCTL register are readable but are not writable.

76543210

CMDB

Reset

11000000

= Unimplemented or Reserved

Figure 27-14. Flash Command Register (FCMD)

Table 27-17. FCMD Field Descriptions

Field

Description

6-0

CMDB[6:0]

Flash Command — Valid Flash commands are shown in Table 27-18. Writing any command other than those

listed in Table 27-18 sets the ACCERR ﬂag in the FSTAT register.

Table 27-18. Valid Flash Command List

CMDB[6:0]

NVM Command

0x05

Erase Verify

0x06

Data Compress

0x20

Word Program

0x40

Sector Erase

0x41

Mass Erase

0x47

Sector Erase Abort

76543210

NV7

NV6

NV5

NV4

NV3

NV2

NV1

NV0

Reset

FFFFF

= Unimplemented or Reserved

Figure 27-15. Flash Control Register (FCTL)

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