Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X Datenbogen
Produktcode
DK-TM4C129X
Description
Reset
Type
Name
Bit/Field
When
PPSCTRL
= 0x3,
EN0PPS
(4 Hz) is a sequence of:
■
Three clocks of 50 percent duty cycle and 268 ms period
■
Fourth clock of 195 ms period (134 ms low and 61 ms high)
This signaling behavior is because of the non-linear toggling of bits in
the digital rollover mode in the Ethernet MAC System Time -
Nanoseconds (EMACTIMNANO) register.
the digital rollover mode in the Ethernet MAC System Time -
Nanoseconds (EMACTIMNANO) register.
December 13, 2013
1744
Texas Instruments-Advance Information
Ethernet Controller