User's Manual

11
PI O0 – PI O1 5
Programmable digital I/O lines. All PIO lines can be configured through software to have either weak or
strong pull-ups or pull-downs. Configuration for each PIO line depends on the application. See section
16 “I/O parallel ports” for detailed descriptions for each terminal. Default conf iguration for all of the PIO
lines is input with weak internal pull-up.
AI O0 – AI O1
AIOs can be used to monitor analogue voltages such as a temperature sensor for the battery charger.
AIOs can also be configured to be used as digital I/Os. The voltage level at these pins is 0 V to 1,5 V.
UART_ N RTS
A CMOS output with a weak internal pull-up. This pin can be used to implement RS232 hardware flow
control where RTS (request to send) is an active low indicator. The UART interface requires an external
RS232 transceiver chip.
UART_ N CTS
A CMOS input with a weak internal pull-down. This pin can be used to implement RS232 hardware flow
control where CTS (clear to send) is an active low indicator. The UART interface requires an external
RS232 transceiver chip.
UART_ RXD
A CMOS input with a weak internal pull-down. RXD is used to implement UART data transfer from
another device to TBM–CBC5.The UART interface requires an external RS232 transceiver chip.
UART_ TXD
A CMOS output with a weak internal pull-up. TXD is used to implement UART data transfer from T BM–CBC5
to another device. The UART interface requires external RS232 transceiver chip.