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ST72321R7-Auto Datasheet(PDF) 182 Page - STMicroelectronics

Part # ST72321R7-Auto
Description  PLL for 2x frequency multiplication
PDF  243 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321R7-Auto Datasheet(HTML) 182 Page - STMicroelectronics

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Instruction set
ST72321xx-Auto
182/243
Doc ID 13829 Rev 1
18.2.1
Using a prebyte
The instructions are described with one to four opcodes.
In order to extend the number of available opcodes for an 8-bit CPU (256 opcodes), three
different prebyte opcodes are defined. These prebytes modify the meaning of the instruction
they precede.
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, direct bit, or direct relative
addressing mode to an instruction using the corresponding indirect
addressing mode.
It also changes an instruction using X indexed addressing mode to an
instruction using indirect X indexed addressing mode.
PIY 91
Replace an instruction using X indirect indexed addressing mode by a Y
one.
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
Table 102.
Instruction groups (continued)
Group
Instructions



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