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Interface Signals
The Modem will communicate with the host through an interface with the following
signals:
Bus
Interface Function
Pin
1
RTS
Or Data Out SPI (
2
Ack_Tx
Or Clock In SPI (
3
N.U.
4
RXD
5
CTS
Or Data In SPI (
6
TXD
7
VDD
8
LOCK
9
RESET
10
GND
11
N.U.
12
N.U.
13
N.U.
14
N.U.
1
((
): SPI hardware only in slave. The user is connected to this bus only in Flash/EEPROM
Programming: In this case, the RESET signal has to be on.
*I = Input O = Output
NOTE: The connector used is the 14FMS-1.0SP-TF 14-pin manufactured and distributed by
JST.
Signal
µC Function
direction
µC*
O
RTS ! Request To Send
1
)
Data Out SPI ! Data out during the programming of the Flash
Program.
I/O
Ack_Tx ! Transmission Ok
1
)
Clock In SPI ! Clock In during the programming of the Flash
Program.
-
-
I
RxD UART - Serial Data Reception
I
CTS ! Clear To Send
1
)
Data In SPI ! Data In during the programming of the Flash
Program.
O
TxD UART - Serial Data Transmission
-
5 volts power for digital ("noisy").
O
Network Synchronization Ok.
I
External Reset. Also used during the programming of the Flash
Program.
-
Ground
I
-
I
-
I
-
I
-
35
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