User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 438 of 909 2019 Ambiq Micro, Inc.
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18 PAD34STRNG 0x0 RW
Pad 34 drive strength
LOW = 0x0 - Low drive strength
HIGH = 0x1 - High drive strength
17 PAD34INPEN 0x0 RW
Pad 34 input enable
DIS = 0x0 - Pad input disabled
EN = 0x1 - Pad input enabled
16 PAD34PULL 0x0 RW
Pad 34 pullup enable
DIS = 0x0 - Pullup disabled
EN = 0x1 - Pullup enabled
15:14 RSVD 0x0 RO
RESERVED
13:11 PAD33FNCSEL 0x3 RW
Pad 33 function select
ADCSE5 = 0x0 - Configure as the analog ADC single ended port 5 input sig-
nal
NCE33 = 0x1 - IOM/MSPI nCE group 33
32kHzXT = 0x2 - Configure as the 32kHz crystal output signal
GPIO33 = 0x3 - Configure as GPIO33
RSVD = 0x4 - Reserved
UA0CTS = 0x5 - Configure as the UART0 CTS input
CT23 = 0x6 - CTIMER connection 23
SWO = 0x7 - Configure as the serial trace data output signal
10 PAD33STRNG 0x0 RW
Pad 33 drive strength
LOW = 0x0 - Low drive strength
HIGH = 0x1 - High drive strength
9 PAD33INPEN 0x0 RW
Pad 33 input enable
DIS = 0x0 - Pad input disabled
EN = 0x1 - Pad input enabled
8 PAD33PULL 0x0 RW
Pad 33 pullup enable
DIS = 0x0 - Pullup disabled
EN = 0x1 - Pullup enabled
7:6 RSVD 0x0 RO
RESERVED
5:3 PAD32FNCSEL 0x3 RW
Pad 32 function select
ADCSE4 = 0x0 - Configure as the analog input for ADC single ended input 4
NCE32 = 0x1 - IOM/MSPI nCE group 32
CT15 = 0x2 - CTIMER connection 15
GPIO32 = 0x3 - Configure as GPIO32
SCCIO = 0x4 - SCARD serial data input/output
RSVD = 0x6 - Reserved
UA1CTS = 0x7 - Configure as the UART1 CTS input
2 PAD32STRNG 0x0 RW
Pad 32 drive strength
LOW = 0x0 - Low drive strength
HIGH = 0x1 - High drive strength
Table 642: PADREGI Register Bits
Bit Name Reset RW Description