mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 444

• Manufacturer Part Number: mcf5407
• Description: Mcf5407 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Misaligned Operands
transfer.
TM[2:0], SIZ[1:0]
Note that with external termination, address signals do not change. With internal
termination, Figure 18-20, A[1:0] increment for the same longword transfer.
18.5 Misaligned Operands
Because operands, unlike opcodes, can reside at any byte boundary, they are allowed to be
misaligned. A byte operand is properly aligned at any address, a word operand is
misaligned at an odd address, and a longword is misaligned at an address not a multiple of
four. Although the MCF5407 enforces no alignment restrictions for data operands
(including program counter (PC) relative data addressing), additional bus cycles are
required for misaligned operands.
18-16
A[31:0], TT[1:0]
TM[2:0], SIZ[1:0]
BE/BWEx, OE
A[31:2], TT[1:0]
BE/BWEx, OE
AS, CSx
Figure 18-19. Longword Read from an 8-Bit Port, External Termination
Figure 18-20. Longword Read from an 8-Bit Port, Internal Termination
D[31:0]
CLKIN
AS, CSx
D[31:0]
R/W
CLKIN
A[1:0]
TIP
TS
TA
R/W
TIP
TS
TA
S0
S0
S1
S1
S2
MCF5407 User’s Manual
S2
S3
Read
S3
Read
S4
S4
S5
Read
S5
Read
S6
S6
Read
S7
Read
S7
S8
S8
S9
Read
S9
Read
S10
S10
S11 S12
S11 S12