參數(shù)資料
型號: ST72T85A5Q6
廠商: 意法半導(dǎo)體
英文描述: 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
中文描述: 8位微控制器48,000鐵路發(fā)展策略光盤,3K內(nèi)存,ADC,兩個定時器,2個SPI,I2C和脊髓損傷接口
文件頁數(shù): 13/117頁
文件大?。?/td> 748K
代理商: ST72T85A5Q6
13/117
ST7285C
2 CENTRAL PROCESSING UNIT
2.1 INTRODUCTION
The CPU has a full 8-bit architecture. Six internal
registers allow efficient 8-bit data manipulation.
The CPU is capable of executing 63 basic instruc-
tions and features 17 main addressing modes.
2.2 CPU REGISTERS
The 6 CPU registers are shown in the program-
ming model inFigure 2. Following an interrupt, all
registers except Y are pushed onto the stack in the
order shown in Figure 3. They are popped from
stack in the reverse order.
Accumulator (A).
The Accumulator is an 8-bit
general purpose register used to hold operands
and the results of the arithmetic and logic calcula-
tions as well as data manipulations.
Index Registers (X and Y).
These 8-bit registers
are used to create effective addresses or as tem-
porary storage areas for data manipulation. The
Cross-Assembler generates a PRECEDE instruc-
tion (PRE) to indicate that the following instruction
refers to the Y register. The Y register is never au-
tomatically stacked. Interrupt routines must push
or pop itby using the PUSH and POP instructions.
Program Counter (PC).
The program counter is a
16-bit register containing the address of the next
instruction to be executed by the CPU.
Figure 2. Organization of Internal CPU Registers
ACCUMULATOR:
X INDEX REGISTER:
Y INDEX REGISTER:
PROGRAM COUNTER:
STACK POINTER:
CONDITION CODE REGISTER:
X = Undefined
RESET VALUE:
X
X X X X X X
7
0
X
RESET VALUE:
X
X X X X X X
7
0
X
RESET VALUE:
X
X X X X X X
7
0
X
15
7
0
RESET VALUE = DEVICE DEPENDENT, SEE MEMORY MAP
RESET VALUE:
X
X X X X X X
7
0
X
15
7
0
RESET VALUE = DEVICE DEPENDENT, SEE MEMORY MAP
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