ST7PLITES2Y0M6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
ST7PLITES2Y0M6
STMicroelectronics
ST7PLITES2Y0M6 Datasheet PDF : 125 Pages
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ST7LITE0x, ST7LITESx
6 CENTRAL PROCESSING UNIT
6.1 INTRODUCTION
This CPU has a full 8-bit architecture and contains
six internal registers allowing efficient 8-bit data
manipulation.
6.2 MAIN FEATURES
■ 63 basic instructions
■ Fast 8-bit by 8-bit multiply
■ 17 main addressing modes
■ Two 8-bit index registers
■ 16-bit stack pointer
■ Low power modes
■ Maskable hardware interrupts
■ Non-maskable software interrupt
6.3 CPU REGISTERS
The six CPU registers shown in Figure 10 are not
present in the memory mapping and are accessed
by specific instructions.
Figure 10. CPU Registers
7
0
RESET VALUE = XXh
7
0
RESET VALUE = XXh
7
0
RESET VALUE = XXh
15
PCH
87
PCL
0
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
7
0
1 1 1 HI NZ C
RESET VALUE = 1 1 1 X 1 X X X
15
87
0
RESET VALUE = STACK HIGHER ADDRESS
Accumulator (A)
The Accumulator is an 8-bit general purpose reg-
ister used to hold operands and the results of the
arithmetic and logic calculations and to manipulate
data.
Index Registers (X and Y)
In indexed addressing modes, these 8-bit registers
are used to create either effective addresses or
temporary storage areas for data manipulation.
(The Cross-Assembler generates a precede in-
struction (PRE) to indicate that the following in-
struction refers to the Y register.)
The Y register is not affected by the interrupt auto-
matic procedures (not pushed to and popped from
the stack).
Program Counter (PC)
The program counter is a 16-bit register containing
the address of the next instruction to be executed
by the CPU. It is made of two 8-bit registers PCL
(Program Counter Low which is the LSB) and PCH
(Program Counter High which is the MSB).
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
PROGRAM COUNTER
CONDITION CODE REGISTER
STACK POINTER
X = Undefined Value
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