ATMEGA128L-8AI Atmel, ATMEGA128L-8AI Datasheet - Page 216
![IC AVR MCU 128K 8MHZ LV 64-TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA128L-8AI
Manufacturer Part Number
ATMEGA128L-8AI
Description
IC AVR MCU 128K 8MHZ LV 64-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128L-8AI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K 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
For Use With
ATSTK501 - ADAPTER KIT FOR 64PIN AVR MCU
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA128L8AI
Available stocks
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Master Receiver Mode
216
ATmega128
In the Master Receiver Mode, a number of data bytes are received from a slave transmitter (see
Figure
of the following address packet determines whether Master Transmitter or Master Receiver
mode is to be entered. If SLA+W is transmitted, MT mode is entered, if SLA+R is transmitted,
MR mode is entered. All the status codes mentioned in this section assume that the prescaler
bits are zero or are masked to zero.
Figure 98. 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 $08 (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 $38, $40, or $48. The appropriate action to be taken for each of these status codes is
detailed in
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 $10) 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
98). In order to enter a Master mode, a START condition must be transmitted. The format
Table
TWINT
TWINT
TWINT
TWINT
1
1
1
1
97. Received data can be read from the TWDR Register when the TWINT flag
Device 1
RECEIVER
MASTER
TWEA
TWEA
TWEA
TWEA
X
X
X
X
TRANSMITTER
Device 2
TWSTA
TWSTA
TWSTA
TWSTA
SLAVE
1
0
0
1
Table
TWSTO
TWSTO
TWSTO
TWSTO
Device 3
0
0
1
0
88). In order to enter MR mode, SLA+R must be
TWWC
TWWC
TWWC
TWWC
X
X
X
X
........
TWEN
TWEN
TWEN
TWEN
Device n
1
1
1
1
V
CC
–
0
–
0
–
0
–
0
R1
TWIE
TWIE
TWIE
TWIE
R2
2467V–AVR–02/11
X
X
X
X
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