Specifications

22
PIO0 – PIO10
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 10 “I/O parallel ports” for detailed descriptions for each
terminal. Default configuration for all of the PIO lines is input with weak internal pull-up.
AIO0 – AIO1
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_NRTS
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_NCTS
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 WT32. 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 WT32 to another device. The UART interface requires external RS232 transceiver
chip.