PM0044 datasheet(57/162 Pages) STMICROELECTRONICS

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PM0044

STM8 addressing modes

Doc ID 13590 Rev 3

57/162

6.13

Bit Direct (Long) addressing mode

The data byte required for the operation is found by its memory address, which follows the

op-code. The bit used for the operation is selected by the bit selector which is encoded in

the instruction op-code.

The address is a word, thus allowing 0000 to FFFF addressing space, but requires 2 bytes

after the op-code. The bit selector #n (n=0 to 7) selects the nth bit from the byte pointed to by

the address.

Example:

Table 37.

Overview of Bit Direct addressing mode instruction

Addressing mode

Syntax

EA formula

Ptr Adr

Ptr Size

Dest adr

Bit

Long Direct

longmem, #pos

(longmem)

op + 1..2

Word

0000..FFFF

Table 38.

Available Bit Direct instructions

Instructions

Functions

BRES

Bit Reset

BSET

Bit Set

BCPL

Bit Complement

BCCM

Copy Carry Bit to Memory

0408

721006E5

BCPL

coeff, #0

06E5

coeff

dc.b

$ 40

Action:

(coeff) = ($06E5) XOR 2**0 = $40 XOR $01 = $41

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