System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 6-101
6.3.1.18 Chip Configuration Register (SIU_CCR)
Address: Base + 0x0980 Access: Read / write[30:31]
012345678910111213 14 15
R
00000000000000MATCHDISNEX
W
Reset
00000000000000 0 X
1
Address: Base + 0x0980 Access: Read / write[30:31]
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
00000000000000 0
TEST
2
W
Reset
00000000000000 0 0
1
When system reset negates, the value in this bit depends on the censorship control word and the boot
configuration bits.
2
This bit is reset with a power-on reset.
Figure 6-135. Chip Configuration Register (SIU_CCR)
Table 6-51. SIU_CCR Field Descriptions
Register Bit Range
Field Name
Description
0–13
Reserved.
14
MATCH
Compare register match. Holds the value of the match input signal to the SIU. The match input
is asserted if the values in the SIU_CARH and SIU_CBRH, as well as the SIU_CARL and
SIU_CBRL are equal. The MATCH bit is reset by the synchronous reset signal.
0 The content of SIU_CARH and SIU_CARL does not match the content of SIU_CBRH and
SIU_CBRL.
1 The content of SIU_CARH and SIU_CARL matches the content of SIU_CBRH and
SIU_CBRL.
15
DISNEX
Disable Nexus. Holds the value of the Nexus disable input signal to the SIU. When system
reset negates, the value in this bit depends on the censorship control word and the boot
configuration bits.
0 Nexus disable input signal is negated.
1 Nexus disable input signal is asserted.
16–30
Reserved.
31
TEST
Test mode enable. Allows reads or writes to undocumented registers used for production tests
only. Because these production test registers are not documented, estimating the impact of
errant accesses to them is impossible. Do not change this bit from its negated state at reset.
0 Undocumented production test registers cannot be read or written.
1 Undocumented production test registers can be read or written.
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