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参数资料
| 型号： | ST72T671N4B1XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP56 |
| 封装： | 0.600 INCH, SHRINK, PLASTIC, DIP-56 |
| 文件页数： | 5/101页 |
| 文件大小： | 608K |
| 代理商： | ST72T671N4B1XXX |
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ST72671
2 CENTRAL PROCESSING UNIT
2.1 Introduction
This CPU has a full 8-bit architecture and contains
six internal registers allowing efficient 8-bit data
manipulation.
2.2 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
8 MHz CPU internal frequency
s
Low power modes
s
Maskable hardware interrupts
s
Non-maskable software interrupt
2.3 CPU Registers
The 6 CPU registers shown in Figure 5 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)
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).
Figure 5. CPU Registers
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
STACK POINTER
CONDITION CODE REGISTER
PROGRAM COUNTER
70
1C
11H I
N Z
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
70
0
7
15
8
PCH
PCL
15
87
0
RESET VALUE = STACK HIGHER ADDRESS
RESET VALUE = 10
1
1 X 101
RESET VALUE = XXh
X = Undefined Value
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