User Manual

Apollo3 Blue Datasheet

DS-A3-0p9p1 Page 405 of 909 2019 Ambiq Micro, Inc.

11.5.7 Implementing Secure Card Connections

The Secure Card signals can be connected to a variety of pads. Table 603 shows the connections for

Secure Card CLK (SCCCLK), which should have the corresponding PADnINPEN and PADnPULL bits

clear. Table 604 shows the connections for Secure Card IO (SCCIO), which must have the corresponding

PADnINPEN bit set and should have the corresponding PADnPULL bit clear.Table 605 shows the

connections for Secure Card RSTIO (SCCRST), which must have the corresponding PADnINPEN and

PADnPULL bits clear.

11.5.8 Implementing GPIO Connections

Each pad of the Apollo3 Blue MCU can be configured as a GPIO port by setting PADnFNCSEL to 3.

PADnINPEN and PADnPULL must be set appropriately depending on the specific GPIO function.

Table 602: I2S DAT Configuration

Field Value Pad

PAD6FNCSEL 7 6

PAD30FNCSEL 7 30

PAD35FNCSEL 4 35

PAD45FNCSEL 4 45

Table 603: Secure Card Clock Configuration

Field Value Pad

PAD8FNCSEL 4 8

PAD17FNCSEL 4 17

PAD19FNCSEL 4 19

PAD31FNCSEL 5 31

Table 604: Secure Card IO Configuration

Field Value Pad

PAD9FNCSEL 4 9

PAD18FNCSEL 7 18

PAD32FNCSEL 4 32

PAD37FNCSEL 4 37

Table 605: Secure Card RST Configuration

Field Value Pad

PAD16FNCSEL 4 16

PAD21FNCSEL 6 21

PAD26FNCSEL 4 26

PAD46FNCSEL 4 46