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AT90PWM3 Datasheet(PDF) 26 Page - ATMEL Corporation |
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AT90PWM3 Datasheet(HTML) 26 Page - ATMEL Corporation |
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26 / 361 page  27 4317I–AVR–01/08 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 337. 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 765 432 10 GPIOR07 GPIOR06 GPIOR05 GPIOR04 GPIOR03 GPIOR02 GPIOR01 GPIOR00 GPIOR0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 000 00 Bit 765 432 10 GPIOR17 GPIOR16 GPIOR15 GPIOR14 GPIOR13 GPIOR12 GPIOR11 GPIOR10 GPIOR1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 000 00 Bit 765 432 10 GPIOR27 GPIOR26 GPIOR25 GPIOR24 GPIOR23 GPIOR22 GPIOR21 GPIOR20 GPIOR2 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 000 00 |
Similar Part No. - AT90PWM3_08 |
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Similar Description - AT90PWM3_08 |
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