ATmega48 Automotive Atmel Corporation, ATmega48 Automotive Datasheet - Page 157

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ATmega48 Automotive

Manufacturer Part Number
ATmega48 Automotive
Description
Manufacturer
Atmel Corporation

Specifications of ATmega48 Automotive

Flash (kbytes)
4 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
0.5
Eeprom (bytes)
256
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
19.4
19.5
19.6
19.6.1
7701E–AVR–02/11
Software Break Points
Limitations of debugWIRE
Register Description
DWDR – debugWire Data Register
When designing a system where debugWIRE will be used, the following observations must be
made for correct operation:
• Pull-Up resistor on the dW/(RESET) line must be in the range of 10k to 20k . However, the
• Connecting the RESET pin directly to V
• Capacitors inserted on the RESET pin must be disconnected when using debugWire.
• All external reset sources must be disconnected.
debugWIRE supports program memory break points by the Atmel
Setting a break point in AVR Studio
The instruction replaced by the BREAK instruction will be stored. When program execution is
continued, the stored instruction will be executed before continuing from the program memory.
A break can be inserted manually by putting the BREAK instruction in the program.
The flash must be re-programmed each time a break point is changed. This is automatically
handled by AVR Studio through the debugWIRE interface. The use of break points will there-
fore reduce the flash data retention. Devices used for debugging purposes should not be
shipped to end customers.
The debugWIRE communication pin (dW) is physically located on the same pin as the external
reset (RESET). An external reset source is, therefore, not supported when the debugWIRE is
enabled.
The debugWIRE system accurately emulates all I/O functions when running at full speed, i.e.,
when the program in the CPU is running. When the CPU is stopped, care must be taken while
accessing some of the I/O registers via the debugger (AVR Studio). See the debugWIRE doc-
umentation for a detailed description of the limitations.
A programmed DWEN fuse enables some parts of the clock system to be running in all sleep
modes. This will increase the power consumption while in sleep. Thus, the DWEN fuse should
be disabled when debugWire is not used.
The following section describes the registers used with the debugWire system.
The debugWire data register (DWDR) provides a communication channel from the program
running in the MCU to the debugger. This register is only accessible by the debugWIRE sys-
tem, and can, therefore, not be used as a general purpose register in normal operations.
Bit
0x27 (0x47)
Read/Write
Initial Value
pull-up resistor is optional.
R/W
7
0
R/W
6
0
Atmel ATtiny24/44/84 [Preliminary]
R/W
5
0
®
will insert a BREAK instruction in the program memory.
CC
R/W
4
0
will not work.
DWDR[7:0]
R/W
3
0
R/W
2
0
®
AVR
R/W
1
0
®
BREAK instruction.
R/W
0
0
DWDR
157

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