ATMEGA32HVB-8X3 Atmel, ATMEGA32HVB-8X3 Datasheet - Page 170

• Manufacturer Part Number: ATMEGA32HVB-8X3
• Description: MCU AVR 32KB FLASH 8MHZ 44TSSOP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32HVB-8X3

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SPI
• Peripherals: POR, WDT
• Number Of I /o: 17
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 25 V
• Data Converters: A/D 7x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TSSOP
• Processor Series: ATMEGA32x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: SPI, TWI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRSB200
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 7 Channel
• Package: 44TSSOP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 8 MHz
• Operating Supply Voltage: 5|9|12|15|18|24 V
• For Use With: ATSTK524 - KIT STARTER ATMEGA32M1/MEGA32C1ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 27-2.
8042B–AVR–06/10
Status Code
(TWSR)
Prescaler Bits
are 0
0x08
0x10
0x18
0x20
0x28
0x30
0x38
Status of the Two-wire Serial
Bus and Two-wire Serial Inter-
face Hardware
A START condition has been
transmitted
A repeated START condition
has been transmitted
SLA+W has been transmitted;
ACK has been received
SLA+W has been transmitted;
NOT ACK has been received
Data byte has been transmit-
ted;
ACK has been received
Data byte has been transmit-
ted;
NOT ACK has been received
Arbitration lost in SLA+W or
data bytes
Status Codes for Master Transmitter Mode
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
enables the master to switch between slaves, Master Transmitter mode and Master Receiver
mode without losing control of the bus.
TWCR
Value
To/from TWDR
Load SLA+W
Load SLA+W or
Load SLA+R
Load data byte or
No TWDR action or
No TWDR action or
No TWDR action
Load data byte or
No TWDR action or
No TWDR action or
No TWDR action
Load data byte or
No TWDR action or
No TWDR action or
No TWDR action
Load data byte or
No TWDR action or
No TWDR action or
No TWDR action
No TWDR action or
No TWDR action
TWINT
1
Application Software Response
TWEA
X
STA
X
X
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
STO
TWSTA
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
To TWCR
TWINT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TWSTO
0
TWEA
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
ATmega16HVB/32HVB
Next Action Taken by TWI Hardware
SLA+W will be transmitted;
ACK or NOT ACK will be received
SLA+W will be transmitted;
ACK or NOT ACK will be received
SLA+R will be transmitted;
Logic will switch to Master Receiver mode
Data byte will be transmitted and ACK or NOT ACK will
be received
Repeated START will be transmitted
STOP condition will be transmitted and
TWSTO flag will be reset
STOP condition followed by a START condition will be
transmitted and TWSTO flag will be reset
Data byte will be transmitted and ACK or NOT ACK will
be received
Repeated START will be transmitted
STOP condition will be transmitted and
TWSTO flag will be reset
STOP condition followed by a START condition will be
transmitted and TWSTO flag will be reset
Data byte will be transmitted and ACK or NOT ACK will
be received
Repeated START will be transmitted
STOP condition will be transmitted and
TWSTO flag will be reset
STOP condition followed by a START condition will be
transmitted and TWSTO flag will be reset
Data byte will be transmitted and ACK or NOT ACK will
be received
Repeated START will be transmitted
STOP condition will be transmitted and
TWSTO flag will be reset
STOP condition followed by a START condition will be
transmitted and TWSTO flag will be reset
Two-wire Serial Bus will be released and not ad-
dressed slave mode entered
A START condition will be transmitted when the bus
becomes free
TWWC
X
TWEN
1
–
0
TWIE
X
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