73M2901CE Data Sheet
DS_2901CE_031
3.4 External Interrupt Pins
Pin Name
RING
DTR
Pin Number
30
28
Type
I
I
Description
External interrupt – Line interface ring detection circuitry input
External interrupt – DTE DTR signal input
3.5 Oscillator Pins
Pin Name
OSCIN
OSCOUT
Pin Number
19
18
Type
I
O
Description
Crystal input for internal oscillator, also input for external source
Crystal oscillator output
8
Rev. 3.4