MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 159

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

11.3
Ten different addressing modes provide programmers with the flexibility to optimize their code for
all situations. The various indexed addressing modes make it possible to locate data tables, code
conversion tables and scaling tables anywhere in the memory space. Short indexed accesses are
single byte instructions; the longest instructions (three bytes) enable access to tables throughout
memory. Short absolute (direct) and long absolute (extended) addressing are also included. One
or two byte direct addressing instructions access all data bytes in most applications. Extended
addressing permits jump instructions to reach all memory locations.
The term ‘effective address’ (EA) is used in describing the various addressing modes. The effective
address is defined as the address from which the argument for an instruction is fetched or stored.
The ten addressing modes of the processor are described below. Parentheses are used to indicate
‘contents of’ the location or register referred to. For example, (PC) indicates the contents of the
location pointed to by the PC (program counter). An arrow indicates ‘is replaced by’ and a colon
indicates concatenation of two bytes. For additional details and graphical illustrations, refer to the
M6805 HMOS/M146805 CMOS Family Microcomputer/ Microprocessor User's Manual or to
the M68HC05 Applications Guide.
11.3.1
In the inherent addressing mode, all the information necessary to execute the instruction is
contained in the opcode. Operations specifying only the index register or accumulator, as well as
the control instruction, with no other arguments are included in this mode. These instructions are
one byte long.
11.3.2
In the immediate addressing mode, the operand is contained in the byte immediately following the
opcode. The immediate addressing mode is used to access constants that do not change during
program execution (e.g. a constant used to initialize a loop counter).
11.3.3
In the direct addressing mode, the effective address of the argument is contained in a single byte
following the opcode byte. Direct addressing allows the user to directly address the lowest 256
bytes in memory with a single two-byte instruction.
MC68HC05X16
Addressing modes
Inherent
Immediate
Direct
Freescale Semiconductor, Inc.
For More Information On This Product,
Address bus high
CPU CORE AND INSTRUCTION SET
Go to: www.freescale.com
EA = (PC+1); PC
EA = PC+1; PC
0; Address bus low
PC+2
PC+2
(PC+1)
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