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ST7LITE49K2 Fiches technique(PDF) 189 Page - STMicroelectronics

No de pièce ST7LITE49K2
Description  Communication interfaces
PDF  245 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LITE49K2 Fiches technique(HTML) 189 Page - STMicroelectronics

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12.2.1
Illegal opcode reset
In order to provide enhanced robustness to the device against unexpected behavior, a
system of illegal opcode detection is implemented: a reset is generated if the code to be
executed does not correspond to any opcode or prebyte value. This, combined with the
Watchdog, allows the detection and recovery from an unexpected fault or interference.
A valid prebyte associated with a valid opcode forming an unauthorized combination does
not generate a reset.
I
Table 68.
Illegal opcode detection
Mnemo
Description
Function/Example
Dst
Src
H
I
N
Z
C
ADC
Add with Carry
A = A + M + C
A
M
H
N
Z
C
ADD
Addition
A = A + M
A
M
H
N
Z
C
AND
Logical And
A = A . M
A
M
N
Z
BCP
Bit compare A, Memory
tst (A . M)
A
M
N
Z
BRES
Bit Reset
bres Byte, #3
M
BSET
Bit Set
bset Byte, #3
M
BTJF
Jump if bit is false (0)
btjf Byte, #3, Jmp1
M
C
BTJT
Jump if bit is true (1)
btjt Byte, #3, Jmp1
M
C
CALL
Call subroutine
CALLR
Call subroutine relative
CLR
Clear
reg, M
0
1
CP
Arithmetic Compare
tst(Reg - M)
reg
M
N
Z
C
CPL
One Complement
A = FFH-A
reg, M
N
Z
1
DEC
Decrement
dec Y
reg, M
N
Z
HALT
Halt
0
IRET
Interrupt routine return
Pop CC, A, X, PC
H
I
N
Z
C
INC
Increment
inc X
reg, M
N
Z
JP
Absolute Jump
jp [TBL.w]
JRA
Jump relative always
JRT
Jump relative
JRF
Never jump
jrf *
JRIH
Jump if ext. interrupt = 1
JRIL
Jump if ext. interrupt = 0
JRH
Jump if H = 1
H = 1 ?
JRNH
Jump if H = 0
H = 0 ?
JRM
Jump if I = 1
I = 1 ?
JRNM
Jump if I = 0
I = 0 ?
JRMI
Jump if N = 1 (minus)
N = 1 ?



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