User Manual

Apollo3 Blue Datasheet

DS-A3-0p9p1 Page 401 of 909 2019 Ambiq Micro, Inc.

which must have the corresponding PADnINPEN bit set and should have the corresponding PADnPULL bit

clear.

11.5.5.3 UART1 TX/RX Connections

The UART data signals TX and RX may each be connected to several pads. Note that TX and RX are

selected independently. Table 594 shows the connections for TX, which should have the corresponding

PADnINPEN and PADnPULL bits clear. Table 595 shows the connections for RX, which must have the

corresponding PADnINPEN bit set and should have the corresponding PADnPULL bit clear.

Table 592: UART0 RTS Configuration

Field Value Pad

PAD3FNCSEL 0 3

PAD5FNCSEL 2 5

PAD13FNCSEL 6 13

PAD18FNCSEL 4 18

PAD34FNCSEL 5 34

PAD35FNCSEL 6 35

PAD37FNCSEL 2 37

PAD41FNCSEL 7 41

Table 593: UART0 CTS Configuration

Field Value Pad

PAD4FNCSEL 0 4

PAD6FNCSEL 2 6

PAD12FNCSEL 6 12

PAD24FNCSEL 4 24

PAD29FNCSEL 4 29

PAD33FNCSEL 5 33

PAD36FNCSEL 6 36

PAD38FNCSEL 2 38