Data Sheet

Pin P03
Since P03 is assigned two features, mode selection and default value, by KATP, here is a
diagram for further description
P03 will be detected at the first 5 sec after reset to determine return-to-default or not, and
will determine to enter AT-CMD or Transparent mode at the 10 sec.
Pin assignment
KATP defines pins of PRBMD0 as following:!
PRBMD00 DATASHEET 1.5
K-SOLUTION
17
PRBMD00 pin
Function in KATP firmware
Description
P34
BLE_Connect (for LED)
Indicates BT connection: Flash when advertising; Solid when connected
P03
MODE_SEL
Goes to AT-CMD or Transparent mode after reset.
P09
UART_TX
UART transmit - connect to Rx of external device
P10
UART_RX
UART receive - connect to Tx of external device
Pin assignment in PRBMD00
reset
10 sec
KATP enter AT-CMD mode,
configuration unchanged
P03 at high
P03 from high
to low
KATP enter Transparent mode,
configuration unchanged
P03 from low
to high
KATP enter AT_CMD mode,
configuration change to default
P03 at low
KATP enter Transparent mode,
configuration change to default