SAE81C91 datasheet(11/41 Pages) INFINEON

Part #	SAE81C91

Description	Standalone Full-CAN Controller

Download	41 Pages

Scroll/Zoom	100%

Manufacturer	INFINEON [Infineon Technologies AG]

Direct Link	http://www.infineon.com

Logo

11 / 41 page

07Feb95@09:05h Intermediate Version

Semiconductor Group

10

SAE 81C90/91

Time Stamp

It is impossible to determine from the received data in the message memory when they were

received. So the host controller is unable to derive any information about the actuality or the

repetition rate of the data.

To enable an indication of the time of reception for at least some of the messages, a 16-bit timer is

implemented on the SAE 81C90/91. The content of this gets written into the time-stamp registers of

the particular message when it is received (for the messages 0 through 7). There are two time-

stamp bytes for each of the messages 0 through 7, and these hold the value of the 16-bit timer.

The actuality of a message is determined by subtracting the old time-stamp of a message, stored in

the host controller, from the new one, with respect to the timer overflow bit.

Overflow of the timer can be detected by bit TSOV in the CTRL register. This bit does not trigger an

interrupt and has to be reset by the host controller. Depending on the setting of bitfield TSP in

register CTRL, the counter is fed with 1/32, 1/64, 1/128 or 1/256 of the bus clock. The momentary

timer status can be read and set at any time. The timer starts at 0 after a reset and cannot be

stopped.

I/O-Ports

There are two parallel I/O ports in the SAE 81C90, each with eight pins. These ports are configured

pin by pin as input or output, depending on the contents of the port-direction register.

The output data for the port pins can be written (latched) into the port-latch register. Reading this

register reproduces the contents of the latch. The levels on the port pins can be read from the port-

pin register.

For the SAE 81C91 in its P-LCC-28-1 package, the pads of the I/O ports are not bonded and

therefore unavailable to the user.

Note: Registers PxPDR and PxPL may be used for general purpose storage if the ports are not

used.

Similar Part No. - SAE81C91

Manufacturer	Part #	Datasheet	Description
Siemens Semiconductor G...	SAE81C52	288Kb / 10P	256 x 8-Bit Static CMOS RAM NMOS-Compatible
	SAE81C52G	288Kb / 10P	256 x 8-Bit Static CMOS RAM NMOS-Compatible
	SAE81C52P	288Kb / 10P	256 x 8-Bit Static CMOS RAM NMOS-Compatible

Manufacturer	Part #	Datasheet	Description
Infineon Technologies A...	82C900	488Kb / 29P	Standalone TwinCAN Controller V 1.0D3, Mar. 2001
Infineon Technologies A...	SAK82C900	478Kb / 29P	Standalone TwinCAN Controller V 1.0D3, Mar. 2001
SMSC Corporation	TMC2084	814Kb / 74P	Standalone Mode CircLink Controller
Texas Instruments	TL16PNP200A	340Kb / 10P	[Old version datasheet] STANDALONE PLUG-AND-PLAY (PnP) CONTROLLER
	TL16PNP100A	281Kb / 20P	[Old version datasheet] STANDALONE PLUG-AND-PLAY (PnP) CONTROLLER
	TL16PNP200	323Kb / 23P	[Old version datasheet] STANDALONE PLUG-AND-PLAY (PnP) CONTROLLER
NXP Semiconductors	AH1014	1Mb / 121P	Application Hints - Standalone high speed CAN transceiver Rev.01.40-27 April 2015
STMicroelectronics	STUSB4500L	646Kb / 31P	Standalone USB Type-C??sink port controller Rev 1 - October 2019
Advantech Co., Ltd.	AMAX-3110	423Kb / 2P	Standalone 6-axis pulse train motion controller 14-May-2020
OKI electronic componet...	MSM9225B	116Kb / 16P	CAN (Controller Area Network) Controller