MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
12-45
lists the bytes required on the data bus for read cycles. The bytes indicated as ‘—’ are not
required during that read cycle.
lists the patterns of the data transfer for write cycles when accesses are initiated by the MCU.
The bytes indicated as ‘—’ are indeterminate and may be driven during that write cycle.
12.4.2.8
Arbitration
The external bus design provides for a single bus master at any one time, either the MCU or an external
device. One of the external devices on the bus has the capability of becoming bus master for the external
bus. Bus arbitration may be handled either by an external central bus arbiter or by the internal on-chip
arbiter. The arbitration configuration (external or internal) is set via the EARB bit in the EBI_MCR.
Table 12-19. Data Bus Requirements for Read Cycles
Transfer
Size
TSIZ[0:1]
1
1
TSIZ is not enabled on the MPC5553.
Address
32-Bit Port Size
16-Bit Port Size
2
2
Also applies when DBM=1 for 16-bit data bus mode.
A30
A31
D0:D7
D8:D15
D16:D23
D24:D31
D0:D7
D8:D15
Byte
01
0
0
OP0
—
—
—
OP0
—
01
0
1
—
OP1
—
—
—
OP1
01
1
0
—
—
OP2
—
OP2
—
01
1
1
—
—
—
OP3
—
OP3
16-bit
10
0
0
OP0
OP1
—
—
OP0
OP1
10
1
0
—
—
OP2
OP3
OP2
OP3
32-bit
00
0
0
OP0
OP1
OP2
OP3
OP0/OP2
3
3
This case consists of two 16-bit external transactions, the first fetching OP0 and OP1, the second fetching OP2
and OP3.
OP1/OP3
Table 12-20. Data Bus Contents for Write Cycles
Transfer
Size
TSIZ[0:1]
1
1
TSIZ is not enabled on the MPC5553.
Address
32-Bit Port Size
16-Bit Port Size
2
2
Also applies when DBM=1 for 16-bit data bus mode.
A30
A31
D0:D7
D8:D15
D16:D23
D24:D31
D0:D7
D8:D15
Byte
01
0
0
OP0
—
—
—
OP0
—
01
0
1
—
OP1
—
—
—
OP1
01
1
0
—
—
OP2
—
OP2
—
01
1
1
—
—
—
OP3
—
OP3
16-bit
10
0
0
OP0
OP1
—
—
OP0
OP1
10
1
0
—
—
OP2
OP3
OP2
OP3
32-bit
00
0
0
OP0
OP1
OP2
OP3
OP0/OP2
3
3
This case consists of two 16-bit external transactions, the first writing OP0 and OP1, the second writing OP2 and OP3.
OP1/OP3
Summary of Contents for MPC5553
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