User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 9 of 909 2019 Ambiq Micro, Inc.
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15. Watchdog Timer Module ............................................................................................... 690
15.1 Functional Overview .............................................................................................. 690
15.2 WDT Registers ...................................................................................................... 690
15.2.1 Register Memory Map .................................................................................. 691
15.2.2 WDT Registers ............................................................................................. 692
16. Reset Generator Module ................................................................................................ 698
16.1 Functional Overview .............................................................................................. 698
16.2 External Reset Pin .................................................................................................. 698
16.3 Power-on Event ...................................................................................................... 699
16.4 Brown-out Events .................................................................................................. 699
16.5 Software Reset ....................................................................................................... 700
16.6 Software Power On Initialization .......................................................................... 700
16.7 Watchdog Expiration ............................................................................................. 700
16.8 RSTGEN Registers ................................................................................................ 700
16.8.1 Register Memory Map .................................................................................. 700
16.8.2 RSTGEN Registers ....................................................................................... 701
17. UART Module ............................................................................................................... 707
17.1 Features .................................................................................................................. 707
17.2 Functional Overview .............................................................................................. 707
17.3 Enabling and Selecting the UART Clock .............................................................. 708
17.4 Configuration ......................................................................................................... 708
17.5 Transmit FIFO and Receive FIFO ......................................................................... 709
17.6 UART Registers ..................................................................................................... 709
17.6.1 Register Memory Map .................................................................................. 709
17.6.2 UART Registers ............................................................................................ 711
18. ADC and Temperature Sensor Module ......................................................................... 723
18.1 Features .................................................................................................................. 723
18.2 Functional Overview .............................................................................................. 724
18.2.1 Clock Source and Dividers ........................................................................... 724
18.2.2 Channel Analog Mux .................................................................................... 724
18.2.3 Triggering and Trigger Sources .................................................................... 725
18.2.4 Voltage Reference Sources ........................................................................... 725
18.2.5 Eight Automatically Managed Conversion Slots .......................................... 725
18.2.6 Automatic Sample Accumulation and Scaling ............................................. 726
18.2.7 Sixteen Entry Result FIFO ............................................................................ 727
18.2.8 DMA ............................................................................................................. 730
18.2.9 Window Comparator ..................................................................................... 731
18.3 Operating Modes and the Mode Controller ........................................................... 732
18.3.1 Single Mode .................................................................................................. 733
18.3.2 Repeat Mode ................................................................................................. 734
18.3.3 Low Power Modes ........................................................................................ 734
18.4 Interrupts ................................................................................................................ 735
18.5 Voltage Divider and Switchable Battery Load ...................................................... 735
19. Voltage Comparator Module ......................................................................................... 764
19.1 Functional Overview .............................................................................................. 764
19.2 VCOMP Registers ................................................................................................. 764