NuMicro® NUC029LEE/NUC029SEE
32-bit Arm
®
Cortex
®
-M0 Microcontroller
Aug, 2018
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5.
Determine auto direction control by programming RS485_AUD (UA_ALT_CSR[10]).
Start
bit
D0
TX pin output
RTS_ST
(UA_MCR[13])
Driver Enable*
RX
TX
RTS
Differential Bus
RS-485 Transceiver
UART / RS-485 Controller
D1
D2
D3
D4
D5
D6
D7
P
Stop
bit
Driver Enable
Note:
RS485_AUD(UA_ALT_CSR[10]) must be set to 1, and LEV_RTS(UA_MCR[9]) must be set to 0.
Figure 6.13-19 Structure of RS-485 Frame