User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 7 of 909 2019 Ambiq Micro, Inc.
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11.5 Module-specific Pad Configuration ....................................................................... 389
11.5.1 Implementing IO Master Connections .......................................................... 389
11.5.2 MSPI Connection .......................................................................................... 396
11.5.3 Implementing IO Slave Connections ............................................................ 396
11.5.4 Implementing Counter/Timer Connections .................................................. 397
11.5.5 Implementing UART Connections ............................................................... 399
11.5.6 Implementing Audio Connections ................................................................ 403
11.5.7 Implementing Secure Card Connections ...................................................... 405
11.5.8 Implementing GPIO Connections ................................................................. 405
11.5.9 Implementing CLKOUT Connections .......................................................... 406
11.5.10 Implementing 32kHz CLKOUT Connections ............................................ 406
11.5.11 Implementing ADC Connections ................................................................ 406
11.5.12 mplementing Voltage Comparator Connections ......................................... 407
11.5.13 Implementing the Software Debug Port Connections ................................ 408
11.5.14 Fast GPIO ................................................................................................... 408
11.6 FASTGPIO Registers ............................................................................................ 408
11.6.1 Register Memory Map .................................................................................. 409
11.6.2 FASTGPIO Registers ................................................................................... 410
11.7 GPIO Registers ...................................................................................................... 412
11.7.1 Register Memory Map .................................................................................. 414
11.7.2 GPIO Registers ............................................................................................. 417
12. Clock Generator and Real Time Clock Module ............................................................ 523
12.1 Clock Generator ..................................................................................................... 523
12.1.1 Functional Overview ..................................................................................... 523
12.1.2 Low Frequency RC Oscillator (LFRC) ....................................................... 524
12.1.3 High Precision XT Oscillator (XT) .............................................................. 525
12.1.4 High Frequency RC Oscillator (HFRC) ....................................................... 526
12.1.5 HFRC Auto-adjustment ................................................................................ 527
12.1.6 Burst Mode Support ...................................................................................... 528
12.1.7 Frequency Measurement ............................................................................... 528
12.1.8 Generating 100 Hz ........................................................................................ 529
12.2 CLKGEN Registers ............................................................................................... 529
12.2.1 Register Memory Map .................................................................................. 530
12.2.2 CLKGEN Registers ...................................................................................... 531
12.3 Real Time Clock .................................................................................................... 547
12.3.1 RTC Functional Overview ............................................................................ 547
12.3.2 Calendar Counters ......................................................................................... 547
12.3.3 Calendar Counter Reads ............................................................................... 547
12.3.4 Alarms ........................................................................................................... 548
12.3.5 12/24 Hour Mode .......................................................................................... 548
12.3.6 Century Control and Leap Year Management .............................................. 548
12.3.7 Weekday Function ........................................................................................ 549
12.4 RTC Registers ........................................................................................................ 549
12.4.1 Register Memory Map .................................................................................. 549
12.4.2 RTC Registers ............................................................................................... 550
13. Counter/Timer Module .................................................................................................. 557