AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 145
AT90USB647-MU
Manufacturer Part Number
AT90USB647-MU
Description
MCU, 8BIT, 64K FLASH, USB, 64QFN
Manufacturer
Atmel
Specifications of AT90USB647-MU
Controller Family/series
AT90
No. Of I/o's
48
Eeprom Memory Size
2KB
Ram Memory Size
4KB
Cpu Speed
16MHz
No. Of
RoHS Compliant
Core Size
8bit
Program Memory Size
64KB
Oscillator Type
External, Internal
Package
64QFN EP
Device Core
AVR
Family Name
AT90
Maximum Speed
20 MHz
Ram Size
4 KB
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
48
Interface Type
SPI/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
Lead Free Status / Rohs Status
Details
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14.10.8
14.10.9
14.10.10 Output Compare Register 1 B – OCR1BH and OCR1BL
14.10.11 Output Compare Register 1 C – OCR1CH and OCR1CL
14.10.12 Output Compare Register 3 A – OCR3AH and OCR3AL
7593K–AVR–11/09
Timer/Counter3 – TCNT3H and TCNT3L
Output Compare Register 1 A – OCR1AH and OCR1AL
The two Timer/Counter I/O locations (TCNTnH and TCNTnL, combined TCNTn) 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.
Registers” on page 119.
Modifying the counter (TCNTn) while the counter is running introduces a risk of missing a com-
pare match between TCNTn and one of the OCRnx Registers.
Writing to the TCNTn Register blocks (removes) the compare match on the following timer clock
for all compare units.
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
TCNT1[15:8]
TCNT1[7:0]
R/W
0
7
TCNT3[15:8]
TCNT3[7:0]
R/W
0
7
OCR1A[15:8]
OCR1A[7:0]
R/W
0
7
OCR1B[15:8]
OCR1B[7:0]
R/W
0
7
OCR1C[15:8]
OCR1C[7:0]
R/W
0
7
OCR3A[15:8]
OCR3A[7:0]
R/W
0
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
0
3
0
3
0
3
0
3
0
3
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
AT90USB64/128
R/W
0
0
R/W
0
0
R/W
0
0
R/W
0
0
R/W
0
0
R/W
0
See “Accessing 16-bit
TCNT1H
TCNT1L
TCNT3H
TCNT3L
OCR1AH
OCR1AL
OCR1BH
OCR1BL
OCR1CH
OCR1CL
OCR3AH
OCR3AL
145
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