ST7LITE49M STMicroelectronics, ST7LITE49M Datasheet - Page 135

• Manufacturer Part Number: ST7LITE49M
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49M

• 4 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10k write/erase cycles guaranteed Data retention
• 128 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow
• A/d Converter: 10 input channels

ST7LITE49M
12.2
Instruction groups
The ST7 family devices use an instruction set consisting of 63 instructions. The instructions
may be subdivided into 13 main groups as illustrated in the following table:
Table 56.
Using a prebyte
The instructions are described with 1 to 4 bytes.
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 by:
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:
Condition Code Flag modification
Conditional bit test and branch
Unconditional jump or call
Interruption management
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
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.
Increment/decrement
Arithmetic operations
Compare and tests
Conditional branch
Logical operations
Load and Transfer
Stack operation
Shift and rotate
Instructions
Bit operation
ST7 instruction set
Doc ID 13562 Rev 3
PUSH
TRAP
BSET
BTJT
JRxx
AND
ADC
JRA
INC
SLL
SIM
CP
LD
BRES
BTJF
POP
DEC
ADD
CLR
TNZ
SRL
WFI
RIM
JRT
OR
HALT
XOR
RSP
BCP
SUB
SRA
SCF
JRF
IRET
SBC
RCF
CPL
RLC
JP
CALL
NEG
RRC
MUL
CALLR
SWAP
Instruction set
NOP RET
SLA
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