参数资料
型号: M37640E8FP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件页数: 56/96页
文件大小: 1477K
代理商: M37640E8FP
6
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.9 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)
1.9.1 Register Structure
Five of the CPU registers are 8-bit registers. These are
the Accumulator (A), Index register X (X), Index Regis-
ter Y (Y), Stack pointer (S), and the Processor Status
register (PS) as shown in Figure 1.4.
The Program counter (PC) is a 16-bit register consist-
ing of two 8-bit registers (PCH and PCL).
After a hardware reset, bit 2 (I Flag) of the PS is set
high and the values at the address FFFA16 and
FFFB16 are stored in the PC, but the values of the
other bits of the PS and other registers are undefined.
Initialization of the undefined registers may be neces-
sary for some programs.
0
7
Accumulator
0
7
Index Register X
0
7
Index Register Y
0
7
Stack Pointer
0
7
PCL
15
PCH
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
Fig. 1.4. Register Structure
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