January 2001/ version 1.4
WMOi3 Integrated Modem
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Figure Figure 1414: : SIM socket
4.1.12 SPI bus
The SPI bus includes a CLK signal, an I/O signal and an EN signal complying with
SPI bus standard. The maximum speed transfer is 3.25Mb/s.
Table 25 : SPI Bus pin description
Signal Pin number I/O I/O type* Description
SPI_CLK 44 O 1X SPI Serial Clock
SPI_IO 43 I/O CMOS / 1X SPI Data
SPI_EN 42 O 1X SPI Enable
*See Table 3 “operating conditions” in subdivision 4.1.1The 50-pin
connector description
4.1.13 Keypad interface
This interface provides 10 connections : 5 rows (R0 to R4) and 5 columns (C0 to
C4).
The scanning is a digital one, and the debouncing is done in the integrated
modem. No discrete components like R,C (Resistor, Capacitor) are needed.
It is possible to scan the column and rows using the: AT+ CMER. command. See
AT command user’s guide for more details.
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