UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
817 of 1269
NXP Semiconductors
UM10503
Chapter 28: LPC43xx State Configurable Timer (SCT)
28.6.1 SCT configuration register
This register configures the overall operation of the SCT. Write to this register before any
other registers.
OUTPUTSET12
R/W
0x560
SCT output 12 set register
0x0000 0000
OUTPUTCL12
R/W
0x564
SCT output 12 clear register
0x0000 0000
OUTPUTSET13
R/W
0x568
SCT output 13 set register
0x0000 0000
OUTPUTCL13
R/W
0x56C
SCT output 13 clear register
0x0000 0000
OUTPUTSET14
R/W
0x570
SCT output 14 set register
0x0000 0000
OUTPUTCL14
R/W
0x574
SCT output 14 clear register
0x0000 0000
OUTPUTSET15
R/W
0x578
SCT output 15 set register
0x0000 0000
OUTPUTCL15
R/W
0x57C
SCT output 15 clear register
0x0000 0000
Table 646. Register overview: State Configurable Timer (base address 0x4000 0000)
…continued
Name
Access Address
offset
Description
Reset value
Reference
Table 647. SCT configuration register (CONFIG - address 0x4000 0000) bit description
Bit
Symbol
Value
Description
Reset
value
0
UNIFY
SCT operation
0
0
The SCT operates as two 16-bit counters named L and H.
1
The SCT operates as a unified 32-bit counter.
2:1
CLKMODE
SCT clock mode
00
0x0
The bus clock clocks the SCT and prescalers.
0x1
The SCT clock is the bus clock, but the prescalers are enabled to count only
when sampling of the input selected by the CKSEL field finds the selected
edge. The minimum pulse width on the clock input is 1 bus clock period. This
mode is the high-performance sampled-clock mode.
0x2
The input selected by CKSEL clocks the SCT and prescalers. The input is
synchronized to the bus clock and possibly inverted. The minimum pulse width
on the clock input is 1 bus clock period. This mode is the low-power
sampled-clock mode.
0x3
The input edge selected by the CKSEL field clocks the SCT and prescalers. In
this mode, the following applies:
Most of the SCT is clocked by the (selected polarity of the) input.
Outputs are switched synchronously to the input clock.
The input clock rate must be at least half the bus clock rate and can be faster
than the bus clock.