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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
810 of 1269
NXP Semiconductors
UM10503
Chapter 28: LPC43xx State Configurable Timer (SCT)
28.5 Pin description
The SCT inputs can originate from the external pins or from several internal sources.
Each SCT input is connected to one GIMA register which defines the input source.
Remark:
SCT outputs are connected to the CTOUT_n pins and are ORed with timer
match outputs when the CTOUCTRL bit is set to 0 in CREG6 (see
; this is the
default). Some SCT outputs are connected to multiple destinations at once, for example to
an external pin and the event router.
Fig 88. SCT counter and select logic
SCT clock
CLK_M4_SCT
prescaler
prescaler
Unified
counter
L counter
H counter
Table 645. SCT inputs and outputs
Description
Pin function Internal signal
Default (see
GIMA,
)
CTOUTCTRL
bit (see
SCT inputs
SCT input 0
CTIN_0
-
yes
-
-
SGPIO3
no
-
-
SGPIO3_DIV
no
-
SCT input 1
CTIN_1
-
yes
-
-
USART2 TX active
no
-
-
SGPIO12
no
-
SCT input 2
CTIN_2
-
yes
-
-
SGPIO12
no
-
-
SGPIO12_DIV
no
-