User guide

M33 EVB User Guide
3.8. Test Points
Figure 15: Test points overview
3.8.1 J104 Test Points
Figure 16: J104 test points
Table 11: Pins of J104
Pin Signal I/O Description
1 DCD1 O Data carrier detection of Serial Port 1
2 RI1 O Ring indicator of Serial Port 1
3 RXD1 I Receive data of Serial Port 1
4 DSR1 O Data set ready of Serial Port 1
5 TXD1 O Transmit data of Serial Port 1
6 RTS1 I Request to send of Serial Port1
7 CTS1 O Clear to send of Serial Port 1
8 DTR1 I Data terminal ready of Serial Port 1
9 SIM_PRESENCE I
SIM card detection. Pulled down
internally.
10 BUZZER_OUT O
Open drain output. Use to drive
buzzer.
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