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UM10503
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User manual
Rev. 2.1 — 10 December 2015
999 of 1441
NXP Semiconductors
UM10503
Chapter 31: LPC43xx/LPC43Sxx State Configurable Timer (SCT) with
Software can read this register at any time to sense the state of the outputs.
31.3.13 SCT bidirectional output control register
This register specifies (for each output) the impact of the counting direction on the
meaning of set and clear operations on the output (see
and
Table 758. SCT output register (OUTPUT, address 0x4000 0050) bit description
Bit
Symbol
Description
Reset
value
15:0
OUT
Writing a 1 to bit n makes the corresponding output HIGH. 0 makes
the corresponding output LOW (output 0 = bit 0, output 1 = bit 1,...,
output 15 = bit 15).
0
31:16
-
Reserved
Table 759. SCT bidirectional output control register (OUTPUTDIRCTRL, address 0x4000 0054) bit description
Bit
Symbol
Value Description
Reset
value
1:0
SETCLR0
Set/clear operation on output 0. Value 0x3 is reserved. Do not program this value.
0
0x0
Independent. Set and clear do not depend on any counter.
0x1
L counter. Set and clear are reversed when counter L or the unified counter is counting
down.
0x2
H counter. Set and clear are reversed when counter H is counting down. Do not use if
UNIFY = 1.
3:2
SETCLR1
Set/clear operation on output 1. Value 0x3 is reserved. Do not program this value.
0
0x0
Independent. Set and clear do not depend on any counter.
0x1
L counter. Set and clear are reversed when counter L or the unified counter is counting
down.
0x2
H counter. Set and clear are reversed when counter H is counting down. Do not use if
UNIFY = 1.
5:4
SETCLR2
Set/clear operation on output 2. Value 0x3 is reserved. Do not program this value.
0
0x0
Independent. Set and clear do not depend on any counter.
0x1
L counter. Set and clear are reversed when counter L or the unified counter is counting
down.
0x2
H counter. Set and clear are reversed when counter H is counting down. Do not use if
UNIFY = 1.
7:6
SETCLR3
Set/clear operation on output 3. Value 0x3 is reserved. Do not program this value.
0
0x0
Independent. Set and clear do not depend on any counter.
0x1
L counter. Set and clear are reversed when counter L or the unified counter is counting
down.
0x2
H counter. Set and clear are reversed when counter H is counting down. Do not use if
UNIFY = 1.
9:8
SETCLR4
Set/clear operation on output 4. Value 0x3 is reserved. Do not program this value.
0
0x0
Independent. Set and clear do not depend on any counter.
0x1
L counter. Set and clear are reversed when counter L or the unified counter is counting
down.
0x2
H counter. Set and clear are reversed when counter H is counting down. Do not use if
UNIFY = 1.