參數(shù)資料
型號: M37640E8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述: 單芯片8位CMOS單片機
文件頁數(shù): 15/172頁
文件大?。?/td> 1193K
代理商: M37640E8
7600 Series
Mitsubishi Microcomputer
2 Functional Description
M37640E8-XXXF Preliminary Specification
Central Processing Unit
7/9/98
2-3
2.1
Central Processing Unit
The central processing unit (CPU) has six registers:
Accumulator (A)
Index Register X (X)
Index Register Y (Y)
Stack Pointer (S)
Processor Status Register (PS)
Program Counter (PC)
2.1.1
Register Structure
Figure 2-1. Register Structure
Five of the CPU registers are 8-bit registers. These are the Accumulator (A), Index register X (X),
Index register Y (Y), Stack pointer (S), and the Processor Status register (PS).
The Program counter (PC) is a 16-bit register consisting of two 8-bit registers (PCH and PCL) (see
Figure 2-1.).
After a hardware reset, bit 2 (the I flag) of the PS is set high and the values at the addresses FFFA
16
and FFFB
16
are stored in the PC, but the values of the other bits of the PS and the other registers are
undefined. Initialization of undefined registers may be necessary for some programs.
2.1.2
Accumulator (A)
The accumulator is the main register of the microcomputer. Data operations such as data transfer, input/
output, and so forth, are executed mainly through the accumulator.
0
7
Accumulator
0
7
Index Register X
0
7
Index Register Y
0
7
Stack Pointer
0
7
PC
L
15
PC
H
0
7
Carry Flag (bit 0)
Zero Flag (bit 1)
Interrupt Disable Flag (bit 2)
Decimal Mode Flag (bit 3)
Break Flag (bit 4)
Index X Mode Flag (bit 5)
Overflow Flag (bit 6)
Negative Flag (bit 7)
Program Counter
D I
Z C
N V T B
Processor Status Register
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