RYZ024A

Datasheet

R19DS0115EU0101 Rev.1.01

Page 3 of 38

Nov.14.22

UART

RYZ024A, when used as a slim modem, has three UARTs available. While the function of the UARTs can be

configured, the default function for each UART is as follows:

•

UART0: data and control from external MCU via AT commands

•

UART1: debug and upgrade

•

UART2: modem console

This default configuration can be overridden. In addition, a fourth UART (UART3) is available for applications

running on RYZ024A.

Note: See section Power for behavior of IOs in Deep Sleep mode.

Table 2.

UART Signals

Pad #

Pad Name

Primary

Function

Alternate

Function1

Power

Group

Direction

Pad

Type2

State at

reset

36

GPIO12/TXD0

TXD0

GPIO12

PVDD_1V

8

In/Out

BIDIR

HighZ, 2 mA

In for primary function, UART0

34

GPIO13/RXD0

RXD0

GPIO13

PVDD_1V

8

In/Out

BIDIR

Out-1, 2 mA

Out for primary function, UART0

35

GPIO14/CTS0

CTS0

GPIO14

PVDD_1V

8

In/Out

BIDIR

Out-1, 2 mA

Out for primary function, UART0

33

RTS0

RTS0

N/A

PMU_5V

In

IN

HighZ

Wake signal enabled by default.

32

TXD1

TXD1

N/A

PVDD_1V

8

In

BIDIR

HighZ, 2 mA

UART1

30

RXD1

RXD1

N/A

PVDD_1V

8

Out

BIDIR

Out-1, 2 mA

UART1

31

CTS1

CTS1

N/A

PVDD_1V

8

Out

BIDIR

Out-1, 2 mA

UART1

29

RTS1

RTS1

N/A

PMU_5V

In

IN

HighZ

Wake signal enabled by default.

28

GPIO15/TXD2

TXD2

GPIO15

PVDD_1V

8

In/Out

BIDIR

HighZ, 2 mA

In for primary function, UART2

26

GPIO16/RXD2

RXD2

GPIO16

PVDD_1V

8

In/Out

BIDIR

Out-1, 2 mA

Out for primary function, UART2

27

GPIO17/CTS2/DC

D0

GPIO17

CTS2/DCD

0

PVDD_1V

8

In/Out

BIDIR

Out-1, 2 mA