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4.5. UART Interfaces
The module supports up to eleven groups of UART interfaces. Two of them are default configurations, see
Table 19 for details. Nine of them can be multiplexed from other interfaces, see Table 23 for details.
Two default UART interfaces are:
⚫
UART: 4-wire UART interface, supports RTS and CTS hardware flow control, up to 4 Mbps.
⚫
DBG_UART: 2-wire UART interface, dedicated for debugging.
Pin definition of the UART interfaces is given as follows:
Table 19: Pin Definition of UART Interfaces
Pin Name
Pin No.
DBG_TXD
317
DBG_RXD
320
UART_TXD
308
UART_RXD
309
UART_RTS
305
UART_CTS
306
UART is a 4-wire UART interface with 1.8 V power domain. A level-shifting chip should be used if your
application is equipped with a 3.3 V UART interface. The following figure shows a reference design.
LDO18B_1V8
UART_CTS
UART_RTS
UART_TXD
UART_RXD
Figure 18: Reference Circuit with Level-Shifting Chip (for UART)
SG560D_Series_Hardware_Design
I/O
Description
DO
Debug UART transmit
DI
Debug UART receive
DO
UART transmit
DI
UART receive
DO
DCE request to send
DI
DCE clear to send
VCCA
C1
100 pF
U1
OE
A1
A2
A3
A4
Comment
If not used, keep them
unconnected. Cannot be
multiplexed into generic
GPIOs.
If not used, keep them
unconnected.
VCCB
C2
100 pF
GND
B1
B2
B3
B4
Smart Module Series
VDD_3V3
CTS_3.3V
RTS_3.3V
TXD_3.3V
RXD_3.3V
67 / 134
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