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en:multiasm:piot:chapter_4_5 [2026/03/01 19:39] – [Extended Indirect Program Memory Addressing] ktokarzen:multiasm:piot:chapter_4_5 [2026/03/01 19:43] (current) – [Addressing Modes] ktokarz
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 ====== Addressing Modes ====== ====== Addressing Modes ======
  
-Addressing modes define how the processor accesses data. There are 15 different addressing modes, such as: Direct Addressing, Indirect Addressing, Indirect with Displacement, Immediate Addressing, Register Addressing, Relative Addressing, Indirect I/O Addressing, and Stack Addressing. +Addressing modes define how the processor accesses data and the target address of a jump. There are more than a dozen different addressing modes, such as: Direct Addressing, Indirect Addressing, Indirect with Displacement, Immediate Addressing, Register Addressing, Relative Addressing, Indirect I/O Addressing, and others. In this section, we first present the data addressing and later addressing used in flow control instructions.
- +
-Details on addressing modes are presented in Fig. {{ref>avr_addr_1}},{{ref>avr_addr_2}},{{ref>avr_addr_3}},{{ref>avr_addr_4}},{{ref>avr_addr_5}},{{ref>avr_addr_6}},{{ref>avr_addr_7}},{{ref>avr_addr_8}},{{ref>avr_addr_9}},{{ref>avr_addr_10}},{{ref>avr_addr_11}},{{ref>avr_addr_12}},{{ref>avr_addr_13}},{{ref>avr_addr_14}} and {{ref>avr_addr_15}}:+
  
 =====Direct Single Register Addressing===== =====Direct Single Register Addressing=====
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 =====Data Indirect Addressing===== =====Data Indirect Addressing=====
-Indirect addressing uses the content of an index register as a pointer to memory. As shown in Fig {{ref>avr_addr_5}}, the operand address is the contents of the X-, Y-, or Z-pointer. Please note that X is formed with concatenated registers R27 and R26, Y is built with R29 and R28, and Z with R31 and R30. In AVR devices without SRAM, Data Indirect Addressing is called Register Indirect Addressing.+Indirect addressing uses the content of an index register as a pointer to memory. As shown in Fig {{ref>avr_addr_5}}, the operand address is the contents of the X, Y, or Z pointer. Please note that X is formed with concatenated registers R27 and R26, Y is built with R29 and R28, and Z with R31 and R30. In AVR devices without SRAM, Data Indirect Addressing is called Register Indirect Addressing.
 An example of the instruction is load data from memory addressed with an X pointer. An example of the instruction is load data from memory addressed with an X pointer.
 <code asm> <code asm>
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 =====Program Memory Constant Addressing===== =====Program Memory Constant Addressing=====
-With this addressing mode, it is possible to read the byte from the program memory. As shown in Fig {{ref>avr_addr_9}}, the byte address in program memory is determined by the value stored in the Z-pointer.+With this addressing mode, it is possible to read the byte from the program memory. As shown in Fig {{ref>avr_addr_9}}, the byte address in program memory is determined by the value stored in the Z pointer.
  
 The upper 15 bits (Most Significant bits - MSbs) select the word address (each word contains 2 bytes). The upper 15 bits (Most Significant bits - MSbs) select the word address (each word contains 2 bytes).
en/multiasm/piot/chapter_4_5.1772386741.txt.gz · Last modified: by ktokarz
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