User Manual

from VDD_PIO and AIO[2:0] are powered from VDD_MEM. PIO[0] and PIO[1] are
normally dedicated to TXEN and RXEN, but they are available for general use. Any of
the PIO lines can be configured as interrupt request lines or as wake-up lines from
sleep modes. PIO[6] can be configured as a request line for an external clock source.
This is useful when the clock to BlueCore2- External is provided from a system ASIC.
I
2
C Interface
PIO[3] and PIO[2] can be used to form a master I2C interface. The interface is formed
using software to drive these lines and is thus suited only to relatively slow functions
such as driving a dot matrix LCD display, a keyboard scanner or an EEPROM.