UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
944 of 1269
NXP Semiconductors
UM10503
Chapter 36: LPC43xx Event monitor/recorder
21
GPCLEAR_EN2
Enables automatically clearing the RTC general purpose registers when an event
occurs on channel 2.
0
0
Channel 2 has no influence on the general purpose registers.
1
An event in channel 2 will clear the general purpose registers asynchronously.
22
POL2
Selects the polarity of an event on input pin WAKEUP2.
0
0
A channel 2 event is defined as a negative edge on WAKEUP2.
1
A channel 2 event is defined as a positive edge on WAKEUP2.
23
EV2_INPUT_EN
Event enable control for channel 2. Event Inputs should remain DISABLED when
not being used for event detection, particularly if the associated pin is being used
for some other function.
0
0
Event 2 input is disabled and forced high internally.
1
Event 2 input is enabled.
29:24 -
Reserved. Read value is undefined, only zero should be written.
NA
31:30 ERMODE
Controls enabling the Event Monitor/Recorder and selecting its operating
frequency. Event Monitor/Recorder registers can always be written to regardless
of the state of these bits. Events occurring during the 1-sec interval immediately
following enabling of the clocks may not be recognized.
0
0x0
Disable Event Monitor/Recorder clocks.
Operation of the Event Monitor/Recorder is disabled except for asynchronous
clearing of GP registers if selected.
0x1
16 Hz sample clock. Enable Event Monitor/Recorder and select a 16 Hz sample
clock for event input edge detection and glitch suppression.
Pulses (in either direction) shorter than 62.5 ms to 125 ms will be filtered out.
0x2
64 Hz sample clock. Enable Event Monitor/Recorder and select a 64 Hz sample
clock for event input edge detection and glitch suppression.
Pulses (in either direction) shorter than 15.6 ms to 31.2 ms will be filtered out.
0x3
1 kHz sample clock. Enable Event Monitor/Recorder and select a 1 kHz sample
clock for event input edge detection and glitch suppression.
Pulses (in either direction) shorter than 1 ms to 2 ms will be filtered out.
Table 814. Event Monitor/Recorder Control Register (ERCONTROL - address 0x4004 6084) bit description
Bit
Symbol
Value
Description
Reset
value