AT91SAM7X128 Atmel, AT91SAM7X128 Datasheet - Page 545
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AT91SAM7X128
Manufacturer Part Number
AT91SAM7X128
Description
MCU 32-Bit 91S ARM7TDMI RISC 128KB Flash 1.8V/3.3V 100-Pin LQFP
Manufacturer
Atmel
Datasheet
1.AT91SAM7X512-AU-999.pdf
(687 pages)
Specifications of AT91SAM7X128
Package
100LQFP
Device Core
ARM7TDMI
Family Name
91S
Maximum Speed
55 MHz
Ram Size
32 KB
Program Memory Size
128 KB
Operating Supply Voltage
1.8|3.3 V
Data Bus Width
32 Bit
Program Memory Type
Flash
Number Of Programmable I/os
62
Interface Type
CAN/Ethernet/SPI/I2S/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
3
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36.8.6
Name:
Access Type:
Any modification on one of the fields of the CANBR register must be done while CAN module is disabled.
To compute the different Bit Timings, please refer to the
• PHASE2: Phase 2 segment
This phase is used to compensate the edge phase error.
Warning: PHASE2 value must be different from 0.
• PHASE1: Phase 1 segment
This phase is used to compensate for edge phase error.
• PROPAG: Programming time segment
This part of the bit time is used to compensate for the physical delay times within the network.
• SJW: Re-synchronization jump width
To compensate for phase shifts between clock oscillators of different controllers on bus. The controller must re-synchronize
on any relevant signal edge of the current transmission. The synchronization jump width defines the maximum of clock
cycles a bit period may be shortened or lengthened by re-synchronization.
• BRP: Baudrate Prescaler.
This field allows user to program the period of the CAN system clock to determine the individual bit timing.
The BRP field must be within the range [1, 0x7F], i.e., BRP = 0 is not authorized.
• SMP: Sampling Mode
0 = The incoming bit stream is sampled once at sample point.
1 = The incoming bit stream is sampled three times with a period of a MCK clock period, centered on sample point.
SMP Sampling Mode is automatically disabled if BRP = 0.
6120H–ATARM–17-Feb-09
31
23
15
–
–
–
7
–
CAN Baudrate Register
t
t
t
t
t
PHS2
PHS1
PRS
SJW
CSC
=
=
=
=
=
30
22
14
CAN_BR
Read-write
–
–
6
t
t
(
CSC
CSC
t
t
BRP
CSC
CSC
×
×
×
×
+
(
(
1
(
(
PROPAG
SJW
PHASE2
PHASE1
)
⁄
PHASE1
MCK
+
29
21
13
–
5
1
)
+
+
+
1
1
1
SJW
)
)
)
AT91SAM7X512/256/128 Preliminary
28
20
12
–
4
Section 36.6.4.1 “CAN Bit Timing Configuration” on page
BRP
27
19
11
–
–
3
–
26
18
10
–
2
PROPAG
PHASE2
25
17
–
9
1
SMP
24
16
8
0
512.
545
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