ATTINY48-MU Atmel, ATTINY48-MU Datasheet - Page 159
![MCU AVR 4K ISP FLASH 1.8V 32-QFN](/photos/12/13/121307/attiny48-mu_sml.jpg)
ATTINY48-MU
Manufacturer Part Number
ATTINY48-MU
Description
MCU AVR 4K ISP FLASH 1.8V 32-QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY48-MU
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, WDT
Number Of I /o
28
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Processor Series
ATTINY4x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
2-Wire, I2S, SPI
Maximum Clock Frequency
12 MHz
Number Of Programmable I/os
24
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
Package
32QFN EP
Device Core
AVR
Family Name
ATtiny
Maximum Speed
12 MHz
Operating Supply Voltage
2.5|3.3|5 V
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATAVRISP2 - PROGRAMMER AVR IN SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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- Current page: 159 of 302
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15.11.4
15.11.5
8008G–AVR–04/11
TWDR – TWI Data Register
TWAR – TWI (Slave) Address Register
• Bits 1:0 – TWPS: TWI Prescaler Bits
These bits can be read and written, and control the bit rate prescaler.
Table 15-7.
To calculate bit rates, see
in the equation.
In Transmit mode, TWDR contains the next byte to be transmitted. In Receive mode, the TWDR
contains the last byte received. It is writable while the TWI is not in the process of shifting a byte.
This occurs when the TWI Interrupt Flag (TWINT) is set by hardware. Note that the Data Regis-
ter cannot be initialized by the user before the first interrupt occurs. The data in TWDR remains
stable as long as TWINT is set. While data is shifted out, data on the bus is simultaneously
shifted in. TWDR always contains the last byte present on the bus, except after a wake up from
a sleep mode by the TWI interrupt. In this case, the contents of TWDR is undefined. In the case
of a lost bus arbitration, no data is lost in the transition from Master to Slave. Handling of the
ACK bit is controlled automatically by the TWI logic, the CPU cannot access the ACK bit directly.
• Bits 7:0 – TWD: TWI Data Register
These eight bits constitute the next data byte to be transmitted, or the latest data byte received
on the 2-wire Serial Bus.
The TWAR should be loaded with the 7-bit Slave address (in the seven most significant bits of
TWAR) to which the TWI will respond when programmed as a Slave Transmitter or Receiver,
and not needed in the Master modes. In multi master systems, TWAR must be set in masters
which can be addressed as Slaves by other Masters.
The LSB of TWAR is used to enable recognition of the general call address (0x00). There is an
associated address comparator that looks for the slave address (or general call address if
enabled) in the received serial address. If a match is found, an interrupt request is generated.
• Bits 7:1 – TWA: TWI (Slave) Address Register
These seven bits constitute the slave address of the TWI unit.
Bit
(0xBB)
Read/Write
Initial Value
Bit
(0xBA)
Read/Write
Initial Value
TWPS1
0
0
1
1
TWI Bit Rate Prescaler
TWD7
TWA6
R/W
R/W
7
1
7
1
TWD6
TWA5
R/W
R/W
“Bit Rate Generator Unit” on page
TWPS0
0
1
0
1
6
1
6
1
TWD5
TWA4
R/W
R/W
5
1
5
1
TWD4
TWA3
R/W
R/W
4
1
4
1
Prescaler Value
1
4
16
64
TWD3
TWA2
R/W
R/W
3
1
3
1
135. The value of TWPS1:0 is used
TWD2
TWA1
R/W
R/W
2
1
2
1
TWD1
TWA0
R/W
R/W
1
1
1
1
ATtiny48/88
TWGCE
TWD0
R/W
R/W
0
1
0
0
TWDR
TWAR
159
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