UPD78F0138 NEC, UPD78F0138 Datasheet - Page 364

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

(C) External maskable interrupt (INTKR)
(D) Software interrupt
17.3 Registers Controlling Interrupt Functions
to interrupt request sources.
364
The following 6 types of registers are used to control the interrupt functions.
• Interrupt request flag register (IF0L, IF0H, IF1L, IF1H)
• Interrupt mask flag register (MK0L, MK0H, MK1L, MK1H)
• Priority specification flag register (PR0L, PR0H, PR1L, PR1H)
• External interrupt rising edge enable register (EGP)
• External interrupt falling edge enable register (EGN)
• Program status word (PSW)
Table 17-2 shows a list of interrupt request flags, interrupt mask flags, and priority specification flags corresponding
IF:
IE:
ISP:
MK:
PR:
KRM: Key return mode register
Interrupt
request
Interrupt request flag
Interrupt enable flag
In-service priority flag
Interrupt mask flag
Priority specification flag
1 when KRMn = 1 (n = 0 to 7)
Interrupt
request
Figure 17-1. Basic Configuration of Interrupt Function (2/2)
Key
interrupt
detector
CHAPTER 17 INTERRUPT FUNCTIONS
IF
User’s Manual U16228EJ2V0UD
MK
Internal bus
Priority controller
IE
Priority controller
Internal bus
PR
Vector table
address generator
ISP
Vector table
address generator
Standby release signal