User's Manual

Table Of Contents
M95 Hardware Design
M95_HD_V1.0 - 45 -
MCU/ARM
MODULE
/TXD
/RXD
TXD
RXD
RTS
CTS
DTR
RI
/RTS
/CTS
GPIO
EINT
voltage level: 3.3V
GPIO
DCD
1K
1K
1K
1K
1K
5K6 5K6 5K6
1K
1K
Figure 23: 3.3V level match circuit
Note: 5.6K resistors among the above diagram need to be changed to 15K resistors for 3V
system.