ATmega16M1 Atmel Corporation, ATmega16M1 Datasheet - Page 26

• Manufacturer Part Number: ATmega16M1
• Manufacturer: Atmel Corporation

Specifications of ATmega16M1

• Flash (kbytes): 16 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: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 14
• Input Capture Channels: 1
• Pwm Channels: 10
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

7.7.4
7.7.5
7.7.6
26
ATmega16M1/32M1/64M1
GPIOR0 – General Purpose I/O Register 0
GPIOR1 – General Purpose I/O Register 1
GPIOR2 – General Purpose I/O Register 2
The next code examples show assembly and C functions for reading the EEPROM. The exam-
ples assume that interrupts are controlled so that no interrupts will occur during execution of
these functions.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Assembly Code Example
C Code Example
EEPROM_read:
unsigned char EEPROM_read(unsigned int uiAddress)
{
}
; Wait for completion of previous write
sbic EECR,EEWE
rjmp EEPROM_read
; Set up address (r18:r17) in address register
out EEARH, r18
out EEARL, r17
; Start eeprom read by writing EERE
sbi EECR,EERE
; Read data from data register
in
ret
/* Wait for completion of previous write */
while(EECR & (1<<EEWE))
/* Set up address register */
EEAR = uiAddress;
/* Start eeprom read by writing EERE */
EECR |= (1<<EERE);
/* Return data from data register */
return EEDR;
;
r16,EEDR
GPIOR07
GPIOR17
GPIOR27
R/W
R/W
R/W
7
0
7
0
7
0
GPIOR06
GPIOR16
GPIOR26
R/W
R/W
R/W
6
0
6
0
6
0
GPIOR05
GPIOR15
GPIOR25
R/W
R/W
R/W
5
0
5
0
5
0
GPIOR04
GPIOR14
GPIOR24
R/W
R/W
R/W
4
0
4
0
4
0
GPIOR03
GPIOR13
GPIOR23
R/W
R/W
R/W
3
0
3
0
3
0
GPIOR02
GPIOR12
GPIOR22
R/W
R/W
R/W
2
0
2
0
2
0
GPIOR01
GPIOR11
GPIOR21
R/W
R/W
R/W
1
0
1
0
1
0
GPIOR00
GPIOR10
GPIOR20
R/W
R/W
R/W
0
0
0
0
0
0
8209D–AVR–11/10
GPIOR0
GPIOR1
GPIOR2