TTP259
TonTouchTM
Preliminary
.. IO port with external interrupt trigger input
The standard input/output port has the IO control register for
switching input or output mode and data register stores the output data in
output mode. If IO control data=1 and output data=1, the IO port is
programmed as input with pull-up resistor and also actives the wake-up
function. User intends to read the port data with differed read instruction.
The read PxI is reading data comes from IO pad data. The data register
reading result will have the same value with output register data. If enable
internal output, the IO port must set as output (IO control data=0). An
additional feature supports the external interrupt trigger input.
IO control data
Output data
Pull-up
R
Wake-up
feature
No
External
input
0
X
0
1
No
No
1
No
No
Enable
Enable
1
Enable
Enable
X: don’t care the value
IO control data
IO pad
0
1
Output internal data
IO pad input data
Read PxI
1
Read input data
IO pad data
2015/05/25
Page 63 of 81
Ver: 1.1
TTELEC [ TT Electronics ]
