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AT90PWM216/316 [DATASHEET]
7710H–AVR–07/2013
All AT90PWM216/316 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 instruc-
tions. 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 instruc-
tions, 0x20 must be added to these addresses. The AT90PWM216/316 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.
5.5
General Purpose I/O Registers
The AT90PWM216/316 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.
5.5.1
General Purpose I/O Register 0 – GPIOR0
5.5.2
General Purpose I/O Register 1 – GPIOR1
5.5.3
General Purpose I/O Register 2 – GPIOR2
5.5.4
General Purpose I/O Register 3– GPIOR3
Bit
765
4321
0
GPIOR07 GPIOR06 GPIOR05 GPIOR04 GPIOR03 GPIOR02 GPIOR01 GPIOR00
GPIOR0
Read/Write
R/W
Initial Value
000
0000
0
Bit
765
4321
0
GPIOR17 GPIOR16 GPIOR15 GPIOR14 GPIOR13 GPIOR12 GPIOR11 GPIOR10
GPIOR1
Read/Write
R/W
Initial Value
000
0000
0
Bit
765
4321
0
GPIOR27 GPIOR26 GPIOR25 GPIOR24 GPIOR23 GPIOR22 GPIOR21 GPIOR20
GPIOR2
Read/Write
R/W
Initial Value
000
0000
0
Bit
765
4321
0
GPIOR37 GPIOR36 GPIOR35 GPIOR34 GPIOR33 GPIOR32 GPIOR31 GPIOR30
GPIOR3
Read/Write
R/W
Initial Value
000
0000
0