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参数资料
型号： ST72P63BE6M1
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封装： 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-24
文件页数： 8/145页
文件大小： 2984K
代理商： ST72P63BE6M1
ST7263BDx ST7263BHx ST7263BKx ST7263BE
105/145
13.2 insTruction groups
The ST7 family devices use an instruction set con-
sisting of 63 instructions. The instructions may be
subdivided into 13 main groups as illustrated in the
following table:
Using a pre-byte
The instructions are described with one to four
bytes.
In order to extend the number of available op-
codes for an 8-bit CPU (256 opcodes), three differ-
ent prebyte opcodes are defined. These prebytes
modify the meaning of the instruction they pre-
cede.
The whole instruction becomes:
PC-2 End of previous instruction
PC-1 Prebyte
PC
Opcode
PC+1 Additional word (0 to 2) according to the
number of bytes required to compute the
effective address
These prebytes enable instruction in Y as well as
indirect addressing modes to be implemented.
They precede the opcode of the instruction in X or
the instruction using direct addressing mode. The
prebytes are:
PDY 90 Replace an X based instruction using
immediate, direct, indexed, or inherent
addressing mode by a Y one.
PIX 92
Replace an instruction using direct, di-
rect bit, or direct relative addressing
mode to an instruction using the corre-
sponding indirect addressing mode.
It also changes an instruction using X
indexed addressing mode to an instruc-
tion using indirect X indexed addressing
mode.
PIY 91
Replace an instruction using X indirect
indexed addressing mode by a Y one.
Load and Transfer
LD
CLR
Stack operation
PUSH
POP
RSP
Increment/Decrement
INC
DEC
Compare and Tests
CP
TNZ
BCP
Logical operations
AND
OR
XOR
CPL
NEG
Bit Operation
BSET
BRES
Conditional Bit Test and Branch
BTJT
BTJF
Arithmetic operations
ADC
ADD
SUB
SBC
MUL
Shift and Rotates
SLL
SRL
SRA
RLC
RRC
SWAP
SLA
Unconditional Jump or Call
JRA
JRT
JRF
JP
CALL
CALLR
NOP
RET
Conditional Branch
JRxx
Interruption management
TRAP
WFI
HALT
IRET
Condition Code flag modification
SIM
RIM
SCF
RCF
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