參數(shù)資料
型號: μPD789F806Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 24/125頁
文件大?。?/td> 366K
代理商: ΜPD789F806Y
CHAPTER 2 REGISTERS
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CHAPTER 2 REGISTERS
2.1 CONTROL REGISTERS
The control registers control the program sequence, statuses and stack memory. A program counter, a program
status word and a stack pointer are control registers.
2.1.1 Program Counter (PC)
The program counter is a 16-bit register which holds the address information of the next program to be executed.
In normal operation, the PC is automatically incremented according to the number of bytes of the instruction to
be fetched. When a branch instruction is executed, immediate data and register contents are set.
RESET input set the reset vector table values at addresses 0000H and 0001H to the program counter.
Figure 2-1. Program Counter Configuration
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0
PC
2.1.2 Program Status Word (PSW)
The program status word is an 8-bit register consisting of various flags to be set/reset by instruction execution.
Program status word contents are automatically stacked upon interrupt request generation or PUSH PSW
instruction execution and are automatically reset upon execution of the RETI and POP PSW instructions.
RESET input sets the PSW to 02H.
Figure 2-2. Program Status Word Configuration
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0
IE
Z
0
AC
0
0
1
CY
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