AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 26
AT90PWM81
Manufacturer Part Number
AT90PWM81
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT90PWM161.pdf
(325 pages)
Specifications of AT90PWM81
Flash (kbytes)
8 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
20
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
3
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.25
Eeprom (bytes)
512
Self Program Memory
YES
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
1
Output Compare Channels
8
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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4.5
4.6
4.6.1
4.6.2
4.6.3
26
I/O Memory
General Purpose I/O Registers
AT90PWM81
General Purpose I/O Register 0 – GPIOR0
General Purpose I/O Register 1 – GPIOR1
General Purpose I/O Register 2 – GPIOR2
The I/O space definition of the AT90PWM81 is shown in
All AT90PWM81 I/Os and peripherals are placed in the I/O space. All I/O locations may be accessed by
the LD/LDS/LDD and ST/STS/STD instructions, transferring data between the 32 general purpose work-
ing registers and the I/O space. I/O registers within the address range 0x00 - 0x1F are directly bit-
accessible using the SBI and CBI instructions. In these registers, the value of single bits can be checked by
using the SBIS and SBIC instructions. Refer to the instruction set section for more details. When using the
I/O specific commands IN and OUT, the I/O addresses 0x00 - 0x3F must be used. When addressing I/O
registers as data space using LD and ST instructions, 0x20 must be added to these addresses. The
AT90PWM81 is a complex microcontroller with more peripheral units than can be supported within the
64 location reserved in Opcode for the IN and OUT instructions. For the Extended I/O space from 0x60 -
0xFF in SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used.
For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O
memory addresses should never be written.
Some of the status flags are cleared by writing a logical one to them. Note that, unlike most other AVR’s,
the CBI and SBI instructions will only operate on the specified bit, and can therefore be used on registers
containing such status flags. The CBI and SBI instructions work with registers 0x00 to 0x1F only.
The I/O and peripherals control registers are explained in later sections.
The AT90PWM81 contains four General Purpose I/O Registers. These registers can be used for storing
any information, and they are particularly useful for storing global variables and status flags.
The General Purpose I/O Registers, within the address range 0x00 - 0x1F, are directly bit-accessible using
the SBI, CBI, SBIS, and SBIC instructions.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
7
GPIOR07
R/W
0
7
GPIOR17
R/W
0
7
GPIOR27
R/W
0
6
GPIOR06
R/W
0
6
GPIOR16
R/W
0
6
GPIOR26
R/W
0
5
GPIOR05
R/W
0
5
GPIOR15
R/W
0
5
GPIOR25
R/W
0
4
GPIOR04
R/W
0
4
GPIOR14
R/W
0
4
GPIOR24
R/W
0
3
GPIOR03
R/W
0
3
GPIOR13
R/W
0
3
GPIOR23
R/W
0
“Register Summary” on page
2
GPIOR02
R/W
0
2
GPIOR12
R/W
0
2
GPIOR22
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
GPIOR01
GPIOR11
GPIOR21
0
GPIOR00
R/W
0
0
GPIOR10
R/W
0
0
GPIOR20
R/W
0
298.
7734P–AVR–08/10
GPIOR0
GPIOR1
GPIOR2
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