HC05V7GRSSLASHD datasheet(149/170 Pages) NXP

149 / 170 page

SECTION 16: INSTRUCTION SET

Page 135

MC68HC05V7 Specification Rev. 1.0

of the bit tested is also placed in the carry bit of the condition code register. The bit set and

bit clear instructions are also read-modify-write instructions and should not be used to

manipulate write-only locations. Refer to the following list for bit manipulation instructions.

16.5

CONTROL INSTRUCTIONS

These instructions are register reference instructions and are used to control processor

operation during program execution. Refer to the following list for control instructions.

16.6

ADDRESSING MODES

The MCU uses ten different addressing modes to provide the programmer with an

opportunity to optimize the 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 (3 bytes) permit accessing tables throughout memory. Short and long absolute

addressing is also included. One- or 2-byte direct addressing instructions access all data

bytes in most applications. Extended addressing permits jump instructions to reach all

memory.

The term “effective address” (EA) is used in describing the various addressing modes.

Effective address is defined as the address from which the argument for an instruction is

fetched or stored.

Function

Set Bit n

Clear Bit n

Mnemonic

BSET n (n = 0. . .7)

BCLR n (n = 0. . .7)

Branch if Bit n is Set

Branch if bit n is Clear

BRSET n (n = 0. . .7)

BRCLR n (n = 0. . .7)

Function

Transfer A to X

Transfer X to A

Set Carry Bit

Clear Carry Bit

Mnemonic

TAX

TXA

SEC

CLC

Set Interrupt Mask Bit

SEI

Clear Interrupt Mask Bit

CLI

Software Interrupt

SWI

Return from Subroutine

RTS

Return from Interrupt

RTI

Reset Stack Pointer

RSP

No-Operation

NOP

Wait

WAIT

Stop

STOP

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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