NXP Semiconductors MC9S12G - Page 1041

128 KByte Flash Module (S12FTMRG128K1V1)
MC9S12G Family Reference Manual Rev.1.27
NXP Semiconductors 1043
29.3.2.11 Flash Common Command Object Register (FCCOB)
The FCCOB is an array of six words addressed via the CCOBIX index found in the FCCOBIX register.
Byte wide reads and writes are allowed to the FCCOB register.
29.3.2.11.1 FCCOB - NVM Command Mode
NVM command mode uses the indexed FCCOB register to provide a command code and its relevant
parameters to the Memory Controller. The user first sets up all required FCCOB fields and then initiates
the command’s execution by writing a 1 to the CCIF bit in the FSTAT register (a 1 written by the user clears
the CCIF command completion flag to 0). When the user clears the CCIF bit in the FSTAT register all
FCCOB parameter fields are locked and cannot be changed by the user until the command completes (as
evidenced by the Memory Controller returning CCIF to 1). Some commands return information to the
FCCOB register array.
The generic format for the FCCOB parameter fields in NVM command mode is shown in Table 29-24.
The return values are available for reading after the CCIF flag in the FSTAT register has been returned to
1 by the Memory Controller. Writes to the unimplemented parameter fields (CCOBIX = 110 and CCOBIX
= 111) are ignored with reads from these fields returning 0x0000.
Table 29-24 shows the generic Flash command format. The high byte of the first word in the CCOB array
contains the command code, followed by the parameters for this specific Flash command. For details on
the FCCOB settings required by each command, see the Flash command descriptions in Section 29.4.6.
Offset Module Base + 0x000A
76543210
R
CCOB[15:8]
W
Reset00000000
Figure 29-16. Flash Common Command Object High Register (FCCOBHI)
Offset Module Base + 0x000B
76543210
R
CCOB[7:0]
W
Reset00000000
Figure 29-17. Flash Common Command Object Low Register (FCCOBLO)
Table 29-24. FCCOB - NVM Command Mode (Typical Usage)
CCOBIX[2:0] Byte FCCOB Parameter Fields (NVM Command Mode)
000
HI FCMD[7:0] defining Flash command
LO 6’h0, Global address [17:16]
001
HI Global address [15:8]
LO Global address [7:0]