參數(shù)資料
型號(hào)： ST72331
廠(chǎng)商： 意法半導(dǎo)體
英文描述： 8-Bit MCU with 8 to 16K ROM/OTP/EPROM, 256 EEPROM, 384 to 512 Bytes RAM, ADC, WDG, SCI, SPI and 2 Timers(8位微控制器(8M))
中文描述： 8位微控制器與8至16K的光碟/雙層/存儲(chǔ)器，256的EEPROM，384字節(jié)RAM為512，藝發(fā)局，水分散粒劑，脊髓損傷，SPI和2計(jì)時(shí)器（8位微控制器（8米））
文件頁(yè)數(shù)： 13/98頁(yè)
文件大?。?/td> 1123K
代理商： ST72331
13/98
ST72331
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
I
63 basic instructions
I
Fast 8-bit by 8-bit multiply
I
17 main addressing modes (with indirect
addressing mode)
I
Two 8-bit index registers
I
16-bit stack pointer
I
8 MHz CPU internal frequency
I
Low power modes
I
Maskable hardware interrupts
I
Non-maskable software interrupt
2.3 CPU Registers
The 6 CPU registers shown in
Figure 1
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 7. CPU Registers
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
STACK POINTER
CONDITION CODE REGISTER
PROGRAM COUNTER
7
1
0
C
1
1 H I
N Z
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
7
0
7
0
7
0
0
7
15
8
PCH
PCL
15
8
7
0
RESET VALUE = STACK HIGHER ADDRESS
RESET VALUE = 1
0
1 1 X 1 0 1
RESET VALUE = XXh
RESET VALUE = XXh
RESET VALUE = XXh
X = Undefined Value
75
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