User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 399 of 909 2019 Ambiq Micro, Inc.
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11.5.5 Implementing UART Connections
The UART signals can be connected to a variety of pads.
11.5.5.1 UART0 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 590 shows the connections for TX, which should have the corresponding
PADnINPEN and PADnPULL bits clear. Table 591 shows the connections for RX, which must have the
corresponding PADnINPEN bit set and should have the corresponding PADnPULL bit clear.
PAD35 (5) CT27
Force
to 0
Force
to 1
B6OUT2 A1OUT B6OUT B2OUT2 A6OUT2 A7OUT2
PAD37 (7) CT29
Force
to 0
Force
to 1
B5OUT2 A1OUT A7OUT A3OUT2 A6OUT2 A7OUT2
PAD39 (2) CT25
Force
to 0
Force
to 1
B4OUT2 B2OUT A6OUT A2OUT2 A6OUT2 A7OUT2
PAD42 (2) CT16
Force
to 0
Force
to 1
A4OUT A0OUT A0OUT2 B3OUT2 A6OUT2 A7OUT2
PAD43 (2) CT18
Force
to 0
Force
to 1
B4OUT B0OUT A0OUT A3OUT2 A6OUT2 A7OUT2
PAD44 (2) CT20
Force
to 0
Force
to 1
A5OUT A1OUT A1OUT2 B2OUT2 A6OUT2 A7OUT2
PAD45 (2) CT22
Force
to 0
Force
to 1
B5OUT B1OUT A6OUT A2OUT2 A6OUT2 A7OUT2
PAD46 (2) CT24
Force
to 0
Force
to 1
A6OUT A2OUT A1OUT B1OUT2 A6OUT2 A7OUT2
PAD47 (2) CT26
Force
to 0
Force
to 1
B6OUT B2OUT A5OUT A1OUT2 A6OUT2 A7OUT2
PAD48 (2) CT28
Force
to 0
Force
to 1
A7OUTB A3OUT A5OUT2 B0OUT2 A6OUT2 A7OUT2
PAD49 (2) CT30
Force
to 0
Force
to 1
B7OUT B3OUT A4OUT2 A0OUT2 A6OUT2 A7OUT2
Table 589: Counter/Timer Pad Configuration
Pad (FNCSEL)
ctimer
output
signal
Output Selection (REG_CTIMER_INCFG)
0 1 2 3 4 5 6 7