Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User’s Manual
Chapter 26 Analog Comparator
FEUL620Q504 26–6
26.3 Function description
26.3.1 Comparator function
The Comparator has following 3 modes.
1. Supervisor mode : Suitable for voltage monitor always.
2. Single mode : Suitable for voltage monitor regularly. Generate interrupts par specified.
3. Single monitor mode : Suitable for voltage monitor regularly. Software outputs compare result
always.
26.3.2 Supervisor mode
This mode set comparator always on. And generate interrupt by variation of the compare result.
Without interrupt, compare result can be monitor by reading CMPnD bit from Software.
Setting instruction:
(1)
Set Operating clock, filtering, interrupt option, and supervisor mode by CMPnMOD register.
The operation of the CMPnTGO signal changes by this setting..
CMPnE1-0 Description
Interrupt CMPnTGO signal
00
No interrupt Asserted when CMPnD is ”1” when
starting measurement or CMPnD is
changed from “0” to ”1” during
measurement.
01
L interrupt : Generate interrupt when CMPnD
is ”0”
CMPnD is ”0” when starting measurement or
CMPnD is changed from “1” to ”0” during
measurement.
Asserted when CMPnD is ”0” when
starting measurement or CMPnD is
changed from “1” to ”0” during
measurement.
10
H interrupt : Generate interrupt when CMPnD
is ”1”
CMPnD is ”1” when starting measurement or
CMPnD is changed from “0” to ”1” during
measurement.
Asserted when CMPnD is ”1” when
starting measurement or CMPnD is
changed from “0” to ”1” during
measurement.
11
Both edge(L and H) interrupt
CMPnD is ”1” when starting measurement or
CMPnD is changed from “0” to ”1” or “1” to ”0”
during measurement.
(2) Set CMPnEN
In case of interrupt, generate interrupt only when the condition set by CMPnE1-0 match.
(3)After Trdy progress, CMPnRF becomes ”1”, and then CMPnD becomes valid;
In case of reading CMPnD with no interrupt or before generating interrupt, please make sure CMPnRF is ”1”.
Because status is stable waiting during CMPnRF is ”0” at operation, CMPnD value is invalid.
CMPnRF need to be “1” when switch to STOP mode.