User Manual

Apollo3 Blue Datasheet

DS-A3-0p9p1 Page 402 of 909 2019 Ambiq Micro, Inc.

11.5.5.4 UART1 RTS/CTS Connections

The UART modem control signals RTS and CTS may each be connected to one of two pads. Note that

RTS and CTS are selected independently. Table 596 shows the connections for RTS, which should have

the corresponding PADnINPEN and PADnPULL bits clear. Table 597 shows the connections for CTS,

Table 594: UART1 TX Configuration

Field Value Pad

PAD8FNCSEL 6 8

PAD10FNCSEL 0 10

PAD12FNCSEL 7 12

PAD14FNCSEL 2 14

PAD18FNCSEL 6 18

PAD20FNCSEL 5 20

PAD24FNCSEL 0 24

PAD35FNCSEL 2 35

PAD37FNCSEL 5 37

PAD39FNCSEL 1 39

PAD42FNCSEL 0 42

PAD47FNCSEL 6 47

Table 595: UART1 RX Configuration

Field Value Pad

PAD2FNCSEL 0 2

PAD4FNCSEL 5 4

PAD9FNCSEL 6 9

PAD13FNCSEL 7 13

PAD15FNCSEL 2 15

PAD19FNCSEL 6 19

PAD21FNCSEL 5 21

PAD25FNCSEL 0 25

PAD36FNCSEL 2 36

PAD40FNCSEL 1 40

PAD43FNCSEL 0 43

PAD47FNCSEL 6 47