Specifications

PL 3120/PL 3150/ PL 3170 Power Line Smart Transceiver Data Book 71
END OF
FRAME
DATA
ONE FRAME
START BIT
APPEARS
START
OF
io_in()
t
fin
87654321
TIME
SERIAL
INPUT
START START STOP
END OF
io_in()
t
ret
Serial Output
Serial Input
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
IO11
Symbol Description Typ @ 10MHz
t
fin
Function call to input sample
Min (first sample)
Max (timeout)
67 µs
20 byte frame
t
ret
Return from function 10 µs
Figure 3.31 Serial Input Object
The duration of this function call is a function of the number of data bits transferred and the transmission bit rate. t
fin
(max) refers to the maximum amount of time this function will wait for a start bit to appear at the input. After
this time, the function will return a 0 as data. t
fin
(min) is the time to the first sampling of the input pin. As an
example, the timeout period at 2400 bits/second is (20 x 10 x 1/2400) + t
fin
(min).