參數(shù)資料
型號(hào)： ST72P63BH4T1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, ROHS COMPLIANT, LQFP-48
文件頁數(shù)： 60/145頁
文件大小： 2984K
代理商： ST72P63BH4T1
ST7263BDx ST7263BHx ST7263BKx ST7263BE
21/145
5 Central processing unit
5.1 Introduction
This CPU has a full 8-bit architecture and contains
six internal registers allowing efficient 8-bit data
manipulation.
5.2 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
5.3 CPU registers
The six CPU registers shown in Figure 10 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 10. CPU registers
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
STACK POINTER
CONDITION CODE REGISTER
PROGRAM COUNTER
70
1C
11 H I
N Z
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
70
0
7
15
8
PCH
PCL
15
8
70
RESET VALUE = STACK HIGHER ADDRESS
RESET VALUE = 1X
11X 1X X
RESET VALUE = XXh
X = Undefined value
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