參數(shù)資料
型號: μPD789217Y
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 104/144頁
文件大小: 632K
代理商: ΜPD789217Y
Preliminary Product Information
104
μ
PD789216Y, 789217Y
(5) Program status word (PSW)
The program status word is used to hold the instruction execution result and the current status of the interrupt
requests. The IE flag, used to enable and disable maskable interrupts, is mapped to the PSW.
The PSW can be read- and write-accessed in 8-bit units, as well as in 1-bit units when using bit manipulation
instructions and dedicated instructions (EI and DI). When a vector interrupt is accepted, the PSW is
automatically saved to a stack, and the IE flag is reset (0).
A RESET input loads 02H into the PSW.
Figure 7-6. Program Status Word Configuration
IE
Z
0
AC
0
0
1
CY
PSW
Symbol
When reset
02H
7
6
5
4
3
2
1
0
IE
0
1
Disable
Enable
Whether to enable/disable interrupt acceptance
Used in the execution of ordinary instructions
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