ST7LITE20F2 STMicroelectronics, ST7LITE20F2 Datasheet - Page 86

• Manufacturer Part Number: ST7LITE20F2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMicroelectronics

Specifications of ST7LITE20F2

• 8 Kbytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit Programming And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55˚C.
• Clock Sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt

ST7LITE2
ST7 ADDRESSING MODES (Cont’d)
12.1.1 Inherent
All Inherent instructions consist of a single byte.
The opcode fully specifies all the required informa-
tion for the CPU to process the operation.
12.1.2 Immediate
Immediate instructions have 2 bytes, the first byte
contains the opcode, the second byte contains the
operand value.
86/133
1
NOP
TRAP
WFI
HALT
RET
IRET
SIM
RIM
SCF
RCF
RSP
LD
CLR
PUSH/POP
INC/DEC
TNZ
CPL, NEG
MUL
SLL, SRL, SRA, RLC,
RRC
SWAP
LD
CP
BCP
AND, OR, XOR
ADC, ADD, SUB, SBC
Immediate Instruction
Inherent Instruction
Interrupt Subroutine Return
Increment/Decrement
No operation
S/W Interrupt
Wait For Interrupt (Low Power
Mode)
Halt Oscillator (Lowest Power
Mode)
Subroutine Return
Set Interrupt Mask
Reset Interrupt Mask
Set Carry Flag
Reset Carry Flag
Reset Stack Pointer
Load
Clear
Push/Pop to/from the stack
Test Negative or Zero
1 or 2 Complement
Byte Multiplication
Shift and Rotate Operations
Swap Nibbles
Load
Compare
Bit Compare
Logical Operations
Arithmetic Operations
Function
Function
12.1.3 Direct
In Direct instructions, the operands are referenced
by their memory address.
The direct addressing mode consists of two sub-
modes:
Direct (short)
The address is a byte, thus requires only 1 byte af-
ter the opcode, but only allows 00 - FF addressing
space.
Direct (long)
The address is a word, thus allowing 64 Kbyte ad-
dressing space, but requires 2 bytes after the op-
code.
12.1.4 Indexed (No Offset, Short, Long)
In this mode, the operand is referenced by its
memory address, which is defined by the unsigned
addition of an index register (X or Y) with an offset.
The indirect addressing mode consists of three
submodes:
Indexed (No Offset)
There is no offset (no extra byte after the opcode),
and allows 00 - FF addressing space.
Indexed (Short)
The offset is a byte, thus requires only 1 byte after
the opcode and allows 00 - 1FE addressing space.
Indexed (long)
The offset is a word, thus allowing 64 Kbyte ad-
dressing space and requires 2 bytes after the op-
code.
12.1.5 Indirect (Short, Long)
The required data byte to do the operation is found
by its memory address, located in memory (point-
er).
The pointer address follows the opcode. The indi-
rect addressing mode consists of two submodes:
Indirect (short)
The pointer address is a byte, the pointer size is a
byte, thus allowing 00 - FF addressing space, and
requires 1 byte after the opcode.
The pointer address is a byte, the pointer size is a
word, thus allowing 64 Kbyte addressing space,
and requires 1 byte after the opcode.
Indirect (long)