System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual,
Rev. 5
Freescale Semiconductor
6-103
6.3.1.20
Compare A High Register (SIU_CARH)
The compare registers are not intended for general application use, but are used temporarily by the BAM
during the booting process, and optionally for communication with calibration tools. After reset,
calibration tools can immediately write a non-zero value to these registers. The application code, using the
registers as read only, can read them to determine if a calibration tool is attached and operate appropriately.
The compare registers can be used exactly like 128 bits of memory mapped RAM that is always zero out
of reset, or they can perform a 64-bit to 64-bit compare. The compare function is continuous
(combinational logic—not requiring a start or stop). The compare result appears in the MATCH bit in the
SIU_CCR register.
The SIU_CARH holds the 32-bit value that is compared against the value in the SIU_CBRH register. The
CMPAH field is read/write and is reset by the synchronous reset signal.
29
Reserved.
30–31
EBDF
[0:1]
External bus division factor. Specifies the frequency ratio between the system clock and
the external clock, CLKOUT. The EBDF field must not be changed during an external bus
access or while an access is pending. The CLKOUT frequency is divided from the system
clock frequency according to the descriptions below. This divider must be kept as
divide-by-2 when operating in dual controller mode.
00 Reserved
01 Divide by 2
10 Reserved
11 Divide by 4
Address: Base + 0x0988
Access: Read / write [0:31]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
CMPAH
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
CMPAH
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-137. Compare A High Register (SIU_CARH)
Table 6-52. SIU_ECCR Field Descriptions (Continued)
Name
Description
Summary of Contents for MPC5553
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