UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 238

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

236
Symbol
(5)
PSW
Program status word (PSW)
The program status word is a register used to hold the instruction execution result and the current status for
interrupt requests. The IE flag to set maskable interrupt enable/disable is mapped to the PSW.
Besides 8-bit unit read/write, this register can carry out operations via bit manipulation instructions and
dedicated instructions (EI, DI). When a vectored interrupt is acknowledged, the PSW is automatically saved
into a stack, and the IE flag is reset to 0.
RESET input sets the PSW to 02H.
IE
IE
7
0
1
Disabled
Enabled
Z
6
5
0
Figure 15-6. Configuration of Program Status Word
AC
4
3
0
CHAPTER 15 INTERRUPT FUNCTIONS
2
0
User’s Manual U13952EJ3V1UD
Interrupt acknowledge enable/disable
1
1
CY
0
After reset
Used when normal instruction is executed
02H