The Point-to-Point Protocol (PPP)
for the
Transmission of Multi-protocol Datagrams
over Point-to-Point Links
Status of this Memo
This RFC specifies an IAB standards track protocol for the Internet
community, and requests discussion and suggestions for improvements.
Please refer to the current edition of the "IAB Official Protocol
Standards" for the standardization state and status of this protocol.
Distribution of this memo is unlimited.
RFC1661 PPP協(xié)議
（RFC1661 The Point-to-Point Protocol (PPP)）
本備忘錄狀態(tài)
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
NORTi3 is a realtime multitasking operating system conforming to the micro-ITRON 3.0
specification. NORTi3 is divided into two packages: NORTi3 Standard and NORTi3 Extended. The
product NORTi3 Extended has implemented all the system calls of level E placed as "added and
extended functions” in the micro-ITRON specification as well as the system calls equivalent to level X.
he LPC932 can be used to create a Pulse Width Modulated PWM signal. That s an analog signal, with only 2 discrete levels, for example 0V and 5V and a constant period. The current value of this signal at a certain poiTnt of time is proportional to its Duty Cycle. That s the High Time during one period divided by the period. It can also be calculated as the average value during a particular period. That means after low pass filtering, (e.g. RC circuit) the signal becomes analog, with an actual value controlled by the microcontroller. The PWM functionality enables the LPC932 to control for example the speed of DC motors or the brightness of electric lighting.
