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System Integration Module (SIM60)
6-44
MC68360 USER’S MANUAL
for entering into low-power mode). Clearing this bit switches the general system clock to
the DFNH value. CSRC is cleared at hardware reset.
0 = General system clock is determined by the DFNH value.
1 = General system clock is determined by the DFNL value.
6.9.3.12 BREAKPOINT ADDRESS REGISTER (BKAR). This register contains the 32-bit
breakpoint address used in the breakpoint address match function. Its contents are only
valid if the valid bit is set in the BKCR. BKAR is undefined at reset.
6.9.3.13 BREAKPOINT CONTROL REGISTER (BKCR). This register contains miscella-
neous bits required for the breakpoint address match function. BKCR is cleared at reset.
Bits 31–20—Reserved
BAS—Breakpoint Acknowledge Support
This bit determines whether to support the CPU32+ breakpoint acknowledge cycle by as-
serting BERR or ignore the breakpoint acknowledge cycle by allowing it to be handled by
the external bus.
0 = No action taken during CPU32+ breakpoint acknowledge cycles.
1 = Assert BERR during CPU32+ breakpoint acknowledge cycles.
NOTE
Do not assert this bit if the QUICC is in slave mode.
BUSS—Bus Select
This bit determines whether the breakpoint logic will use the IMB value or the external bus
value to detect breakpoint match.
0 = Use the IMB.
1 = Use the external bus. A0 and A1 are masked from the comparison.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
BA31
BA30
BA29
BA28
BA27
BA26
BA25
BA24
BA23
BA22
BA21
BA20
BA19
BA18
BA17
BA16
U
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15
14
13
12
11
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BA15
BA14
BA13
BA12
BA11
BA10
BA9
BA8
BA7
BA6
BA5
BA4
BA3
BA2
BA1
BA0
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31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
————————————
BAS
BUSS
RW1
RW0
0000
15
14
13
12
11
10
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SIZM
SIZ1
SIZ0
NEG
MA1
MA0
AS8
AS7
AS6
AS5
AS4
AS3
AS2
AS1
AS0
V
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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