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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
12-14
Freescale Semiconductor
•
SIZE, SIZEN fields in EBI_MCR
Section 12.5.1, “Booting from External Memory
” for additional information.
12.3.1.2
Separate Input Clock for Registers
The EBI registers are accessed with a clock signal separate from the clock used by the rest of the EBI. In
module disable mode, the clock used by the non-register portion of the EBI is disabled to reduce power
consumption. The clock signal dedicated to the registers, however, allows access to the registers even
while the EBI is in the module disable mode. Flag bits in the EBI transfer error status register (EBI_TESR),
however, are set and cleared with the clock used by the non-register portion of the EBI. Consequently, in
module disable mode, the EBI_TESR does not have a clock signal and is therefore not writable.
12.3.1.3
EBI Module Configuration Register (EBI_MCR)
The EBI_MCR contains bits that configure various attributes associated with EBI operation.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
SIZEN
SIZE
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base (0xC3F8_4000)
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R ACGE
EXTM EARB
EARP
0
0
0
0
MDIS
0
0
0
0
0
DBM
W
Reset
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base (0xC3F8_4000)
Figure 12-2. EBI Module Configuration Register (EBI_MCR)
Table 12-7. EBI_MCR Field Descriptions
Bits
Name
Description
0–4
—
Reserved.
5
SIZEN
SIZE enable. The SIZEN bit enables the control of transfer size by the SIZE field (as
opposed to external TSIZ pins) for external master transactions to internal address space.
0 Transfer size controlled by TSIZ[0:1] pins
1 Transfer size controlled by SIZE field
6–7
SIZE
Transfer size. The SIZE field determines the transfer size of external master transactions
to internal address space when SIZEN=1. This field is ignored when SIZEN=0. SIZE
encoding:
00 32-bit
01 Byte
10 16-bit
11 Reserved
Содержание MPC5553
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