UM10503
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User manual
Rev. 1.3 — 6 July 2012
150 of 1269
NXP Semiconductors
UM10503
Chapter 12: LPC43xx Clock Control Unit (CCU)
12.5.4 CCU1/2 branch clock status registers
Each output clock generated from the CCU has a status register. When writing to the
configuration register of an output clock, the Auto or Wake-up mechanism can delay the
update of the actual hardware signals. The Status Register shows the current value of
these signals. All output clock Status Registers follow the format as described in
.
Table 107. CCU2 branch clock configuration register (CLK_XXX_CFG, addresses 0x4005
2100, 0x4005 2200,..., 0x4005 2800) bit description
Bit
Symbol
Value
Description
Reset
value
Access
0
RUN
Run enable
1
R/W
0
Clock is disabled.
1
Clock is enabled.
1
AUTO
Auto (AHB disable mechanism) enable
0
R/W
0
Auto is disabled.
1
Auto is enabled.
2
WAKEUP
Wake-up mechanism enable
0
R/W
0
Wake-up is disabled.
1
Wake-up is enabled.
31:3
-
Reserved
-
-
Table 108. CCU1 branch clock status register (CLK_XXX_STAT, addresses 0x4005 1104,
0x4005 110C,..., 0x4005 1A04) bit description
Bit
Symbol
Description
Reset
value
Access
0
RUN
Run enable status
0 = clock is disabled.
1 = clock is enabled.
1
R
1
AUTO
Auto (AHB disable mechanism) enable status
0 = Auto is disabled.
1 = Auto is enabled.
0
R
2
WAKEUP
Wake-up mechanism enable status
0 = Wake-up is disabled.
1 = Wake-up is enabled.
0
R
31:3
-
Reserved
-
-