UM10503
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User manual
Rev. 1.3 — 6 July 2012
65 of 1269
NXP Semiconductors
UM10503
Chapter 8: LPC43xx Event router
8.6.2 Edge configuration register
This register works in combination with the level configuration register HILO (see
) to configure the level or edge detection for each input to the event router.
The EDGE configuration register determines whether the event router responds to a level
change (EDGEn=1), or a constant level (EDGEn=0). The HILOn bit determines a
response to a rising edge (HILOn=1) or a falling edge (HILOn=0).
When a HIGH level detect is active, the event router status bits cannot be cleared until the
signal is LOW. When a rising edge detect is active, the event router status bit can be
cleared right after the event has occurred.
15
QEI_L
Level detect mode for QEI event.
0
0
Detect LOW level of the QEI interrupt if bit 15 in the EDGE
register is 0. Detect falling edge if bit 15 in the EDGE
register is 1.
1
Detect HIGH level of the QEI interrupt if bit 15 in the EDGE
register is 0. Detect rising edge if bit 15 in the EDGE
register is 1.
16
TIM14_L
Level detect mode for combined timer output 14 event.
0
0
Detect LOW level of GIMA output 27 if bit 16 in the EDGE
register is 0. Detect falling edge if bit 16 in the EDGE
register is 1.
1
Detect HIGH level of GIMA output 27 if bit 16 in the EDGE
register is 0. Detect rising edge if bit 16 in the EDGE
register is 1.
18:17 -
-
Reserved.
19
RESET_L
Level detect mode for Reset
0
0
Detect LOW level if bit 17 in the EDGE register is 0. Detect
falling edge if bit 17 in the EDGE register is 1.
1
Detect HIGH level if bit 17 in the EDGE register is 0.
Detect rising edge if bit 17 in the EDGE register is 1.
31:20 -
-
Reserved.
Table 32.
Level configuration register (HILO - address 0x4004 4000) bit description
Bit
Symbol
Value Description
Reset
value
Table 33.
EDGE and HILO combined register settings
HILO bit n
EDGE bit n
Description
0
0
Detect LOW level
0
1
Detect falling edge
1
0
Detect HIGH level
1
1
Detect rising edge