參數(shù)資料
型號： ST72774S9T1
廠商： 意法半導(dǎo)體
元件分類： ADC
英文描述： 8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
中文描述： 8位USB單片機(jī)的顯示器，高達(dá)60K章檢察官辦公室，每1000內(nèi)存，模數(shù)轉(zhuǎn)換器，定時器，同步，材質(zhì)單元，脈寬調(diào)制/的BRM，的H / W DDC的
文件頁數(shù)： 15/144頁
文件大?。?/td> 1280K
代理商： ST72774S9T1
ST72774/ST727754/ST72734
15/144
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
I
Two 8-bit index registers
I
16-bit stack pointer
I
Low power modes
I
Maskable hardware interrupts
I
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
register 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
instruction (PRE) to indicate that the following
instruction refers to the Y register.)
The Y register is not affected by the interrupt
automatic 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
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
X
1 1
X 1 X X
RESET VALUE = XXh
RESET VALUE = XXh
RESET VALUE = XXh
X = Undefined Value
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