Specifications

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7.3 Outputting Internal Clocks
Internal clocks can be routed to either AIO0 or AIO1 by setting PS Keys. To route internal clock to AIO0 set
PSKEY_AMUX_AIO0 to 0x00fe. Following table shows how to set the PSKEY_AMUX_CLOCK to get certain
frequency from AIO0.
AMUX_CLOCK
Freq (MHz) @ AIO0
0x0014
1
0x0004
2
0x0013
3
0x0017
4
0x0003
6
0x0016
6.5
0x0007
8
0x0011
12
0x0006
13
0x0002
16
0x0009
24
0x0005
32
Table 15: Selectable internal clock frequencies from AIO0
iWRAP does not support this feature. To use this feature either the particular PS Keys must be set to each
module separately or then ask for custom FW from Bluegiga.
7.4 Auxiliary ADC
Simple iWRAP command can be used to read the ADC output from either of the two AIO pins. Refer to latest
iWRAP user manual for the detailed information.
7.5 Software I2C Interface
PIO6, PIO7 and PIO8 can be used to form a master I²C interface. The interface is formed using software to
drive these lines. Therefore it is suited only to relatively slow functions such as driving a dot matrix LCD,
keyboard scanner or configuring external audio codec. I
2
C interface requires a custom FW.