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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
991 of 1441
NXP Semiconductors
UM10503
Chapter 31: LPC43xx/LPC43Sxx State Configurable Timer (SCT) with
Table 747. SCT configuration register (CONFIG, address 0x4000 0000) bit description
Bit
Symbol
Value
Description
Reset
value
0
UNIFY
SCT operation
0
0
16-bit.The SCT operates as two 16-bit counters named L and H.
1
32-bit. The SCT operates as a unified 32-bit counter.
2:1
CLKMODE
SCT clock mode
00
0x0
Bus clock. The bus clock clocks the SCT and prescalers.
0x1
Prescaled bus clock. 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
SCT Input. 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
Reserved.
6:3
CKSEL
SCT clock select
0000
0x0
Rising edges on input 0.
0x1
Falling edges on input 0.
0x2
Rising edges on input 1.
0x3
Falling edges on input 1.
0x4
Rising edges on input 2.
0x5
Falling edges on input 2.
0x6
Rising edges on input 3.
0x7
Falling edges on input 3.
0x8
Rising edges on input 4.
0x9
Falling edges on input 4.
0xA
Rising edges on input 5.
0xB
Falling edges on input 5.
0xC
Rising edges on input 6.
0xD
Falling edges on input 6.
0xE
Rising edges on input 7.
0xF
Falling edges on input 7.
7
NORELAOD_L
-
A 1 in this bit prevents the lower match and fractional match registers from
being reloaded from their respective reload registers. Software can write to set
or clear this bit at any time. This bit applies to both the higher and lower
registers when the UNIFY bit is set.
0
8
NORELOAD_H
-
A 1 in this bit prevents the higher match and fractional match registers from
being reloaded from their respective reload registers. Software can write to set
or clear this bit at any time. This bit is not used when the UNIFY bit is set.
0
16:9
INSYNC
-
Synchronization for input n (bit 9 = input 0, bit 10 = input 1,..., bit 16 = input 7). A
1 in one of these bits subjects the corresponding input to synchronization to the
SCT clock, before it is used to create an event. If an input is synchronous to the
SCT clock, keep its bit 0 for faster response.
When the CKMODE field is 1x, the bit in this field, corresponding to the input
selected by the CKSEL field, is not used.
1