ATMEGA8535L-8JI Atmel, ATMEGA8535L-8JI Datasheet - Page 198
![IC AVR MCU 8K LV 8MHZ IND 44PLCC](/photos/6/70/67043/453-44-plcc_sml.jpg)
ATMEGA8535L-8JI
Manufacturer Part Number
ATMEGA8535L-8JI
Description
IC AVR MCU 8K LV 8MHZ IND 44PLCC
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8535L-8JI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 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
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA8535L-8JI
Manufacturer:
TI
Quantity:
5 000
Part Number:
ATMEGA8535L-8JI
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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Slave Transmitter Mode
198
ATmega8535(L)
In the Slave Transmitter mode, a number of data bytes are transmitted to a Master
Receiver (see Figure 92). All the status codes mentioned in this section assume that the
prescaler bits are zero or are masked to zero.
Figure 92. Data Transfer in Slave Transmitter Mode
To initiate the Slave Transmitter mode, TWAR and TWCR must be initialized as follows:
The upper seven bits are the address to which the Two-wire Serial Interface will respond
when addressed by a Master. If the LSB is set, the TWI will respond to the general call
address (0x00), otherwise it will ignore the general call address.
TWEN must be written to one to enable the TWI. The TWEA bit must be written to one
to enable the acknowledgement of the device’s own slave address or the general call
address. TWSTA and TWSTO must be written to zero.
When TWAR and TWCR have been initialized, the TWI waits until it is addressed by its
own slave address (or the general call address if enabled) followed by the data direction
bit. If the direction bit is “1” (read), the TWI will operate in ST mode, otherwise SR mode
is entered. After its own slave address and the write bit have been received, the TWINT
Flag is set and a valid status code can be read from TWSR. The status code is used to
determine the appropriate software action. The appropriate action to be taken for each
status code is detailed in Table 78. The Slave Transmitter mode may also be entered if
arbitration is lost while the TWI is in the Master mode (see state 0xB0).
If the TWEA bit is written to zero during a transfer, the TWI will transmit the last byte of
the transfer. State 0xC0 or state 0xC8 will be entered, depending on whether the Master
Receiver transmits a NACK or ACK after the final byte. The TWI is switched to the not
addressed Slave mode, and will ignore the Master if it continues the transfer. Thus the
Master Receiver receives all “1” as serial data. State 0xC8 is entered if the Master
demands additional data bytes (by transmitting ACK), even though the Slave has trans-
mitted the last byte (TWEA zero and expecting NACK from the Master).
While TWEA is zero, the TWI does not respond to its own slave address. However, the
Two-wire Serial Bus is still monitored and address recognition may resume at any time
SDA
SCL
TWAR
Value
TWCR
Value
TRANSMITTER
Device 1
SLAVE
TWINT
TWA6
0
Device 2
RECEIVER
MASTER
TWEA
TWA5
1
TWSTA
Device 3
TWA4
Device’s Own Slave Address
0
TWSTO
TWA3
........
0
Device n
TWWC
TWA2
0
V
CC
TWEN
TWA1
1
R1
TWA0
–
0
2502K–AVR–10/06
R2
TWGCE
TWIE
X
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