User Manual

Apollo3 Blue Datasheet

DS-A3-0p9p1 Page 400 of 909 2019 Ambiq Micro, Inc.

11.5.5.2 UART0 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 592 shows the connections for RTS, which should have

the corresponding PADnINPEN and PADnPULL bits clear. Table 593 shows the connections for CTS,

Table 590: UART0 TX Configuration

Field Value Pad

PAD1FNCSEL 2 1

PAD7FNCSEL 5 7

PAD16FNCSEL 6 16

PAD20FNCSEL 4 20

PAD22FNCSEL 0 22

PAD26FNCSEL 6 26

PAD28FNCSEL 6 28

PAD30FNCSEL 4 30

PAD39FNCSEL 0 39

PAD41FNCSEL 6 41

PAD44FNCSEL 6 44

PAD48FNCSEL 0 48

Table 591: UART0 RX Configuration

Field Value Pad

PAD2FNCSEL 2 2

PAD11FNCSEL 6 11

PAD17FNCSEL 6 17

PAD21FNCSEL 4 21

PAD23FNCSEL 0 23

PAD27FNCSEL 0 27

PAD29FNCSEL 6 29

PAD31FNCSEL 4 31

PAD40FNCSEL 0 40

PAD45FNCSEL 6 45

PAD49FNCSEL 0 49