NXP Semiconductors FXTH870 D Series, Manual

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FXTH870xD
Sensors
Freescale Semiconductor, Inc.
43
5.12 System STOP Exit Status Register (SIMSES)
The SIMSES register at $180D can be used to determine the source of an MCU wakeup from the STOP modes. The flags are
as shown in
Figure 27 . All of the flags are automatically cleared when the MCU goes into a STOP mode. Writes to any of these
bits are ignored.
6
LVWACK
Low-Voltage Warning Acknowledge — The LVWF bit indicates the low voltage warning status.
Writing a logic 1 to LVWACK clears LVWF to a logic 0 if a low voltage warning is not present.
5
LVDV
Low-Voltage Detect Voltage Select — The LVDV bit selects the LVD trip point voltage (V
LVD
).
0 Low trip point selected (V
LVD
= V
LVDL
)
1 High trip point selected (V
LVD
= V
LVDH
)
4
LVWV
Low-Voltage Warning Voltage Select — The LVWV bit selects the LVW trip point voltage (V
LVW
).
0 Low trip point selected (V
LVW
= V
LVDL
)
1 High trip point selected (V
LVW
= V
LVDH
)
3:0
Reserved
Reserved Bits — These bits are reserved should not be altered by the user. Any read returns a logical zero.
$180D Bit 7 6 5 4 3 2 1 Bit 0
R
Reserved KBF IRQF TRF PWUF LFF RFF
W
RESET:
0 0 0 0 0 0 0 0
= Reserved
Figure 27. SIM STOP Exit Status (SIMSES)
Table 31. SIMSES Register Field Descriptions
Field Description
7:6
Reserved
Reserved Bits — These bits are reserved for Freescale firmware control. Application software shall assure these two bits are
never overwritten.
5
KBF
Keyboard Flag — This bit indicates that any keyboard pin caused the last exit from STOP mode.
0 Keyboard pin did not cause the last exit from STOP mode
1 Keyboard pin caused the last exit from STOP mode
4
IRQF
IRQ Flag — This bit indicates that IRQ pin caused the last exit from STOP mode.
0 IRQ pin did not cause the last exit from STOP mode
1 IRQ pin caused the last exit from STOP mode
3
TRF
Temperature Restart Flag — This bit indicates that the temperature restart module caused the last exit from STOP mode.
0 TR module did not cause the last exit from STOP mode
1 TR module caused the last exit from STOP mode
2
PWUF
PWU Flag — This bit indicates that the PWU module caused the last exit from STOP mode.
0 PWU module did not cause the last exit from STOP mode
1 PWU module caused the last exit from STOP mode
1
LFF
LFR Flag — This bit indicates that the LFR module caused the last exit from STOP mode.
0 LFR module did not cause the last exit from STOP mode
1 LFR module caused the last exit from STOP mode
0
RFF
RFM Flag — This bit indicates that the RFM module caused the last exit from STOP mode.
0 RFM module did not cause the last exit from STOP mode
1 RFM module caused the last exit from STOP mode
Table 30. SRTISC Register Field Descriptions (continued)
Field Description