Data Sheet 01.97 Preliminary
Microcomputer Components
SAE 81C90/91
Standalone Full-CAN Controller
Semiconductor Group
1
01.97
q
Full CAN controller for data rate up to 1 Mbaud
q
Complies with CAN specification V2.0 part A
(part B passive)
q
Up to 16 messages simultaneous
(each with maximum data length)
q
Message identifier reprogrammable
"on the fly"
q
Several transmit jobs can be sent
with a single command
q
Transmit check
q
Basic CAN feature
q
Time stamp for eight messages
q
Two host interfaces
(parallel and serial)
q
User-configurable outputs
for different bus concepts
q
Programmable clock output
q
Two 8 bit I/O-Port extension
(P-LCC-44-1 package only)
Stand Alone
Full CAN Controller
SAE 81C90/91
The device comes in two versions:
SAE 81C90 in a P-LCC-44-1 package with two 8-bit l/O ports, and
SAE 81C91 in a P-LCC-28-1 package without l/O ports.
Controller Area Network (CAN): License of Robert Bosch GmbH
SAE 81C90/91
Revision History:
Version 01.97
Previous Releases:
06.95
05.94 (Copy version)
Page
Subjects
1056
Figure 1 corrected.
1057
Figure 2 corrected.
1059
Notes updated.
1065 - 1084
Register description and arrangement improved.
1066, 1069
New register maps.
1093
t
AVLL
,
t
LLAX
,
t
DVWH
changed to 10 ns.
1093
t
WHDX
changed to 5 ns.
P-LCC-44-1
P-LCC-28-1
07Feb95@09:05h Intermediate Version
Semiconductor Group
2
SAE 81C90/91
Introduction
The Siemens Stand Alone Full CAN (SFCAN) circuit incorporates all the parts for completely
autonomous transmission and reception of messages using the CAN protocol. The flexible,
programmable interface allows hookup to different implementations of the physical layer. The link to
a host controller can be made either by a multiplexed 8-bit address/data bus or by a high-speed,
serial synchronous interface.
Figure 1
Logic Symbol
Ordering Information
Type
Ordering Code
Package
Function
SAE 81C91
Q67121-F0001
P-LCC-28-1
Stand Alone Full CAN Controller
Temperature range 40 to + 110 C
SAE 81C90
Q67121-H9038
P-LCC-44-1
Stand Alone Full CAN Controller
Temperature range 40 to + 110 C
07Feb95@09:05h Intermediate Version
Semiconductor Group
3
SAE 81C90/91
Pin Configurations
(top view)
Figure 2
07Feb95@09:05h Intermediate Version
Semiconductor Group
4
SAE 81C90/91
Pin Definitions and Functions
Symbol
Pin Number
Input (I)
Output (O)
Function
PLCC-48 PLCC-28
X1
1)
11
28
O
Crystal oscillator output.
Must be unconnected for external clock input.
X2
1)
10
27
I
Crystal oscillator input.
Used for external clock input.
CLKOUT
1)
14
3
O
Clock output
RES
19
4
I
Reset. (Schmitt trigger characteristic)
AD0/DI
42
19
I/O
PI: Address / Data bus / SI: Data input
AD1/DO
43
20
I/O
PI: Address / Data bus / SI: Data output
AD2/CLK
44
21
I/O
PI: Address / Data bus / SI: Clock input
AD3/W
1
22
I/O
PI: Address / Data bus / SI: Write select
AD4/TIM
2
23
I/O
PI: Address / Data bus / SI:
TIM = 0: Timing A; TIM = 1: Timing B
AD5
3
24
I/O
PI: Address/Data bus
AD6
4
25
I/O
PI: Address/Data bus
AD7
5
26
I/O
PI: Address/Data bus
RD
35
16
I
PI: Read / SI: no Function
WR
36
17
I
PI: Write / SI: no Function
ALE
34
15
I
PI: Address Latch Enable / SI:no Function
CS
27
12
I
Chip Select
INT
41
18
O
Interrupt
MS
26
11
I
Mode Select (PI
SI)
P00 ... P03,
P04 ... P07
28, 29,
30, 31,
37, 38,
39, 40
I/O
I/O
Port 0
These pins provide internal pullup resistors of
about 10...200 k
.
P10 ... P13,
P14 ... P17
18, 17,
16, 15,
9, 8, 7, 6
I/O
I/O
Port 1
These pins provide internal pullup resistors of
about 10...200 k
.
TX0
25
10
O
Transmitter output 0
TX1
24
9
O
Transmitter output 1
RX0
23
8
I
Comparator input 0 / Digital input
2)
RX1
22
7
I
Comparator input 1
2)
V
DDA
20
5
I
Analog power supply for comparator
(may be unconnected using the digital mode)
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