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PM0044 Datasheet(PDF) 87 Page - STMicroelectronics

Part # PM0044
Description  STM8 CPU programming manual
PDF  162 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0044 Datasheet(HTML) 87 Page - STMicroelectronics

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PM0044
STM8 instruction set
Doc ID 13590 Rev 3
87/162
Syntax
BTJT dst,#pos,rel
pos = [0..7], rel is relative jump label
e.g.:
BTJT PADR,#7,skip
Operation
PC = PC+lgth
PC = PC + rel IF (dst AND (2**pos)) <> 0
Description
Read the destination byte, test the corresponding bit (bit position), and
jump to 'rel' label if the bit is true (1), else continue the program to the next
instruction. The tested bit is saved in the C flag. The destination is a
memory byte. The bit position is a constant. The jump label represents a
signed offset to be added to the current PC/instruction address (relative
jump). This instruction is used for boolean variable manipulation, hardware
register flag tests, or I/O polling.
Instruction overview
C
⇒
Tested bit is saved in the C flag.
Detailed description
See also: BTJF
BTJT
Bit Test and Jump if True
BTJT
mnem
dst
bit position
jump label
Affected condition flags
VI1
H
I0
N
Z
C
BTJT
Mem
#pos
rel
-
-----
C
dst
pos = 0..7
Asm
cy
lgth
Op-code(s)
ST7
longmem
n= 2*pos
BTJT
$1000,#1,loop
2/3
5
72
0n
MS
LS
XX



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