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ST7261 Datasheet(PDF) 10 Page - STMicroelectronics

No. de pieza ST7261
Descripción Electrónicos  LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, ROM MEMORY, LVD, WDG, TIMER
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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ST7261 Datasheet(HTML) 10 Page - STMicroelectronics

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ST7261
10/80
4 CENTRAL PROCESSING UNIT
4.1 INTRODUCTION
This CPU has a full 8-bit architecture and contains
six internal registers allowing efficient 8-bit data
manipulation.
4.2 MAIN FEATURES
s
Enable executing 63 basic instructions
s
Fast 8-bit by 8-bit multiply
s
17 main addressing modes (with indirect
addressing mode)
s
Two 8-bit index registers
s
16-bit stack pointer
s
Low power HALT and WAIT modes
s
Priority maskable hardware interrupts
s
Non-maskable software/hardware interrupts
4.3 CPU REGISTERS
The 6 CPU registers shown in Figure 6 are not
present in the memory mapping and are accessed
by specific instructions.
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)
These 8-bit registers are used to create effective
addresses or as temporary storage areas for data
manipulation. (The Cross-Assembler generates a
precede instruction (PRE) to indicate that the fol-
lowing instruction refers to the Y register.)
The Y register is not affected by the interrupt auto-
matic procedures.
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).
Figure 6. CPU Registers
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
STACK POINTER
CONDITION CODE REGISTER
PROGRAM COUNTER
70
1C
1I1 H I0 N Z
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
70
70
70
0
7
15
8
PCH
PCL
15
8
70
RESET VALUE = STACK HIGHER ADDRESS
RESET VALUE = 1X
11 X 1 X X
RESET VALUE = XXh
RESET VALUE = XXh
RESET VALUE = XXh
X = Undefined Value


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