参数资料
型号: mPD789322
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器与2/4/8K字节在系统可编程闪存
文件页数: 60/96页
文件大小: 482K
代理商: MPD789322
Preliminary Product Information U14673EJ1V0PM00
63
PD789322,789324,789326,789327
(4) Program status word (PSW)
The program status word is used to hold the instruction execution results 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 written in 8-bit units, as well as in 1-bit units by using bit manipulation instructions
and dedicated instructions (EI and DI). When a vector interrupt is acknowledged, the PSW is automatically
saved to the stack, and the IE flag is reset (0).
RESET input sets the PSW to 02H.
Figure 6-5. Program Status Word Configuration
IE
Z
0
AC
0
1
CY
PSW
Symbol
After reset
02H
76543210
Used in the execution of ordinary instructions
IE
0
1
Disabled
Enabled
Interrupt acknowledgement enable/disable
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