AT90CAN64-16AUR Atmel, AT90CAN64-16AUR Datasheet - Page 231
AT90CAN64-16AUR
Manufacturer Part Number
AT90CAN64-16AUR
Description
MCU AVR 64K FLASH 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® 90CANr
Datasheet
1.AT90CAN32-16AUR.pdf
(428 pages)
Specifications of AT90CAN64-16AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
CAN, EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Data Bus Width
8 bit
Data Ram Size
4 KB
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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18.8.6
7679H–CAN–08/08
Combining Several TWI Modes
In some cases, several TWI modes must be combined in order to complete the desired action.
Consider for example reading data from a serial EEPROM. Typically, such a transfer involves
the following steps:
Note that data is transmitted both from master to slave and vice versa. The master must instruct
the slave what location it wants to read, requiring the use of the MT mode. Subsequently, data
must be read from the slave, implying the use of the MR mode. Thus, the transfer direction must
be changed. The master must keep control of the bus during all these steps, and the steps
should be carried out as an atomical operation. If this principle is violated in a multimaster sys-
tem, another master can alter the data pointer in the EEPROM between steps 2 and 3, and the
master will read the wrong data location. Such a change in transfer direction is accomplished by
transmitting a REPEATED START between the transmission of the address byte and reception
of the data. After a REPEATED START, the master keeps ownership of the bus. The following
figure shows the flow in this transfer.
Figure 18-19. Combining Several TWI Modes to Access a Serial EEPROM
1. The transfer must be initiated
2. The EEPROM must be instructed what location should be read
3. The reading must be performed
4. The transfer must be finished
S
S = START
Transmitted from master to slave
SLA+W
A
Master Transmitter
ADDRESS
A
Rs = REPEATED START
Rs
Transmitted from slave to master
SLA+R
AT90CAN32/64/128
A
Master Receiver
DATA
P = STOP
A
231
P
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