AT90PWM3 datasheet(26/361 Pages) ATMEL

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4317J–AVR–08/10

AT90PWM2/3/2B/3B

6.4

I/O Memory

The I/O space definition of the AT90PWM2/2B/3/3B is shown in “Register Summary” on page

335.

All AT90PWM2/2B/3/3B 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 working 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 AT90PWM2/2B/3/3B 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.

6.5

General Purpose I/O Registers

The AT90PWM2/2B/3/3B 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.

6.5.1

General Purpose I/O Register 0 – GPIOR0

6.5.2

General Purpose I/O Register 1 – GPIOR1

6.5.3

General Purpose I/O Register 2 – GPIOR2

Bit

765

4321

GPIOR07 GPIOR06 GPIOR05 GPIOR04 GPIOR03 GPIOR02 GPIOR01 GPIOR00

GPIOR0

Read/Write

R/W

Initial Value

000

0000

Bit

765

4321

GPIOR17 GPIOR16 GPIOR15 GPIOR14 GPIOR13 GPIOR12 GPIOR11 GPIOR10

GPIOR1

Read/Write

R/W

Initial Value

000

0000

Bit

765

4321

GPIOR27 GPIOR26 GPIOR25 GPIOR24 GPIOR23 GPIOR22 GPIOR21 GPIOR20

GPIOR2

Read/Write

R/W

Initial Value

000

0000

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