attiny13-20ss ATMEL Corporation, attiny13-20ss Datasheet - Page 20
attiny13-20ss
Manufacturer Part Number
attiny13-20ss
Description
8-bit Microcontroller With 1k Bytes In-system Programmable Flash - Atmel Corporation
Manufacturer
ATMEL Corporation
Datasheet
1.ATTINY13-20SS.pdf
(177 pages)
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I/O Memory
The I/O space definition of the ATtiny13 is shown in “Register Summary” on page 159.
All ATtiny13 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 instruc-
tions. 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.
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 AVRs, 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.
ATtiny13
20
2535G–AVR–01/07
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