User's Manual

MeiG hardware design guide
10
VREG_L2_1P2
1.8
200
VREG_L6_1P8
-
1.8
200
VREG_L17_2P85
-
2.85
420
VREG_L11_SDC
1.75~3.337
2.95
600
VREG_L8_2P9
-
2.9
300
VREG_L14_UIM1
1.75~3.337
1.8/3.3
55
VREG_L15_UIM2
1.75~3.337
1.8/3.3
55
4.5 Serial Port
The SLM756P provides two serial ports for communication. UART1 with hardware flow
control, UART2 default for debugging.
Table 4.3: UART Pin Description
Name
Pin
Direction
Function
UART_TX
80
O
UART1 Data Transmission
UART_RX
79
I
UART1 Data Reception
UART_CTS
78
I
UART1
Clear To Send
UART_RTS
77
O
UART1Request To Send
UART_MSM_TX
82
O
UART2 Data Transmission
UART_MSM_RX
81
I
UART2 DataReception
Please refer to the following connection method:
Figure 4.13: Serial Port Connection Diagram
When the serial level used by the user does not match the module, in addition to adding the
level shifting IC, the following figure can also be used to achieve level matching. Only the
matching circuits on TX and RX are listed here. Other low speed signals can refer to this two
circuits.