ATmega1284 Atmel Corporation, ATmega1284 Datasheet - Page 136
ATmega1284
Manufacturer Part Number
ATmega1284
Description
Manufacturer
Atmel Corporation
Specifications of ATmega1284
Flash (kbytes)
128 Kbytes
Pin Count
44
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
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)
16
Eeprom (bytes)
4096
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 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
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16.11.4
16.11.5
16.11.6
8272C–AVR–06/11
TCNT1H and TCNT1L –Timer/Counter1
TCNT3H and TCNT3L –Timer/Counter3
OCR1AH and OCR1AL – Output Compare Register1 A
A FOCnA/FOCnB strobe will not generate any interrupt nor will it clear the timer in Clear Timer
on Compare match (CTC) mode using OCRnA as TOP.
The FOCnA/FOCnB bits are always read as zero.
The two Timer/Counter I/O locations (TCNT1H and TCNT1L, combined TCNT1) give direct
access, both for read and for write operations, to the Timer/Counter unit 16-bit counter. To
ensure that both the high and low bytes are read and written simultaneously when the CPU
accesses these registers, the access is performed using an 8-bit temporary High Byte Register
(TEMP). This temporary register is shared by all the other 16-bit registers. See “Accessing 16-bit
Registers” on page 113.
Modifying the counter (TCNT1) while the counter is running introduces a risk of missing a com-
pare match between TCNT1 and one of the OCRnx Registers.
Writing to the TCNT1 Register blocks (removes) the compare match on the following timer clock
for all compare units.
The two Timer/Counter I/O locations (TCNT3H and TCNT3L, combined TCNT3) give direct
access, both for read and for write operations, to the Timer/Counter unit 16-bit counter. To
ensure that both the high and low bytes are read and written simultaneously when the CPU
accesses these registers, the access is performed using an 8-bit temporary High Byte Register
(TEMP). This temporary register is shared by all the other 16-bit registers. See “Accessing 16-bit
Registers” on page 113.
Modifying the counter (TCNT3) while the counter is running introduces a risk of missing a com-
pare match between TCNT3 and one of the OCRnx Registers.
Writing to the TCNT3 Register blocks (removes) the compare match on the following timer clock
for all compare units.
Bit
(0x85)
(0x84)
Read/Write
Initial Value
Bit
(0x95)
(0x94)
Read/Write
Initial Value
Bit
(0x89)
(0x88)
Read/Write
Initial Value
ATmega164A/PA/324A/PA/644A/PA/1284/P
R/W
R/W
R/W
7
0
7
0
7
0
R/W
R/W
R/W
6
0
6
0
6
0
R/W
R/W
R/W
5
0
5
0
5
0
R/W
R/W
R/W
4
0
4
0
4
OCR1A[15:8]
0
TCNT1[15:8]
TCNT3[15:8]
OCR1A[7:0]
TCNT1[7:0]
TCNT3[7:0]
R/W
R/W
R/W
3
0
3
0
3
0
R/W
R/W
R/W
2
0
2
0
2
0
R/W
R/W
R/W
1
0
1
0
1
0
R/W
R/W
R/W
0
0
0
0
0
0
OCR1AH
OCR1AL
TCNT1H
TCNT3H
TCNT1L
TCNT3L
136
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