Intel MCS 51 User Manual

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83C152 HARDWARE DESCRIPTION
Followingthe informationalcontrol fieldcomesthe in-
When the modeis 10,the sendingstation is indicating
formationto be transferred. that its receiveris not readyto accept frame.
In the supervisoryformat (bits 1,0 = 0,1)bits 3,2 de-
Mode 11is an illegalmode in SDLCprotocol.
terrninewhichmodeis beingused.
Bits 7,6,5representthe value of the sequencethe sta-
Wherrthe modeis00it indicatesthat the receivelineof tion expectswhenthe next transfer occursfor that sta-
the station that sent the supervisoryframe is enabled tion.Thereisnoinformationfollowingthe controlfield
and reSdyto SCCeptframes. whenthe supervisoryformat is used.
When the mode is 01, it indicates that previouslya
In the unnumberedformat ~ts 1,0 = 1,1)bits 7, 6,5,
receivedframe was rejected. The value in the receive 3, 2 (noticebit 4 is missing)indicate
commandstlom
count identifieswhich frame(s) need to be retrarsssnit- the primaryto
secondarystationsor requestsofsexxmd-
ted.
ary stations to the primary.
The standardcommandsare:
BITS 7 6 5 3 2
00000
00001
01000
00100
11001
10111
11100
Command
UnnumberedInformation(Ul)
Set initializationmode(SIM)
Disconnect(DISC)
Responseoptional(UP)
Functiondescriptorin
informationfield(CFGR)
Identificationin informationfield.(XID)
Test patternin informationfield.(TEST)
The standardresponsesare:
BITS
7 6 5 3 2
00000
00001
00011
10001
01100
11111
11001
01000
10111
11 100
Command
Unnumberedinformation(Ul)
Requestforinitialization(RIM)
Stationindisconnectedmode (DM)
Invalidframereoeived(FRMR)
Unnumberedacknowledgement(UA)
Signalloseof input(BCN)
Functiondescriptorin informationfield (CFGR)
Stationwantsto disconnect(RD)
Identificationin informationfield(XID)
Test patternin informationfield(TEST)
7-30

Intel MCS 51 Specifications

General

Brand	Intel
Model	MCS 51
Category	Microcontrollers
Language	English