Microchip Technology RN1810, Manual

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2016-2021 Microchip Technology Inc. DS50002460C-page 13
RN1810/RN1810E
2.0 CIRCUIT DESCRIPTION
2.1 UART Interface
The UART interface supports 2-wire (RX, TX) and 4-
wire configurations with hardware flow control (RX, TX,
CTS and RTS) as illustrated in
Figure 2-1 . The logic
levels are CMOS voltage levels (not RS-232 voltage
levels). The UART interface supports baud rates of
9,600, 19,200, 38,400, 57,600 and 115,200 bits per
second.
FIGURE 2-1: HOST MCU TO RN1810/RN1810E BLOCK DIAGRAM
FIGURE 2-2: MCU TO RN1810 INTERFACE
S
leep
/W
ake
u
p
/
Re
set
/C
o
n
tro
l
Ev
e
n
ts
/Sta
tu
s
Application(s)
UART Driver
Any MCU
UA
RT
RN1810/RN1810E
Power
Ground
TX
RX
RTS
CTS
RX
TX
CTS
(1)
RTS
(1)
MCU
RN1810
Note 1: Hardware flow control is recommended for all baud rates, especially for
57,600 or greater.