ATMEGA64A-MNR Atmel, ATMEGA64A-MNR Datasheet - Page 216
ATMEGA64A-MNR
Manufacturer Part Number
ATMEGA64A-MNR
Description
IC MCU AVR 64K FLASH 8QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA64A-AU.pdf
(392 pages)
Specifications of ATMEGA64A-MNR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
64KB (32K x 16)
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
*
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
SPI, UART, I2C
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
53
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Operating Temperature Range
- 40 C to + 85 C
Processor To Be Evaluated
ATMEGA64A
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8160C–AVR–07/09
Figure 21-13. Data Transfer in Master Receiver Mode
A START condition is sent by writing the following value to TWCR:
TWEN must be written to one to enable the Two-wire Serial Interface, TWSTA must be written to
one to transmit a START condition and TWINT must be set to clear the TWINT flag. The TWI will
then test the Two-wire Serial Bus and generate a START condition as soon as the bus becomes
free. After a START condition has been transmitted, the TWINT flag is set by hardware, and the
status code in TWSR will be 0x08 (see
transmitted. This is done by writing SLA+R to TWDR. Thereafter the TWINT bit should be
cleared (by writing it to one) to continue the transfer. This is accomplished by writing the follow-
ing value to TWCR:
When SLA+R have been transmitted and an acknowledgment bit has been received, TWINT is
set again and a number of status codes in TWSR are possible. Possible status codes in Master
mode are 0x38, 0x40, or 0x48. The appropriate action to be taken for each of these status codes
is detailed in
flag is set high by hardware. This scheme is repeated until the last byte has been received. After
the last byte has been received, the MR should inform the ST by sending a NACK after the last
received data byte. The transfer is ended by generating a STOP condition or a repeated START
condition. A STOP condition is generated by writing the following value to TWCR:
A REPEATED START condition is generated by writing the following value to TWCR:
After a repeated START condition (state 0x10) the Two-wire Serial Interface can access the
same slave again, or a new slave without transmitting a STOP condition. Repeated START
TWCR
Value
TWCR
Value
TWCR
Value
TWCR
Value
SDA
SCL
Device 1
RECEIVER
MASTER
Table
TWINT
TWINT
TWINT
TWINT
1
1
1
1
21-5. Received data can be read from the TWDR Register when the TWINT
TWEA
TWEA
TWEA
TWEA
TRANSMITTER
Device 2
X
X
X
X
SLAVE
TWSTA
TWSTA
TWSTA
TWSTA
1
0
0
1
Device 3
Table
TWSTO
TWSTO
TWSTO
TWSTO
21-2). In order to enter MR mode, SLA+R must be
0
0
1
0
........
TWWC
TWWC
TWWC
TWWC
X
X
X
X
Device n
V
CC
TWEN
TWEN
TWEN
TWEN
1
1
1
1
R1
ATmega64A
–
0
–
0
–
0
–
0
R2
TWIE
TWIE
TWIE
TWIE
X
X
X
X
216
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