UPD78F1502AGK-GAK-AX Datasheet, PDF (756/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 19 INTERRUPT FUNCTIONS
CHAPTER 19 INTERRUPT FUNCTIONS
<R>
Maskable External
interrupts _internal
78K0R/LF3
80 pins
30
8
78K0R/FG3
100 pins
33
12
78K0R/LH3
128 pins
33
13
19.1 Interrupt Function Types
The following two types of interrupt functions are used.
(1) Maskable interrupts
These interrupts undergo mask control. Maskable interrupts can be divided into four priority groups by setting the
priority specification flag registers (PR00L, PR00H, PR01L, PR01H, PR02L, PR02H, PR10L, PR10H, PR11L, PR11H,
PR12L, PR12H).
Multiple interrupt servicing can be applied to low-priority interrupts when high-priority interrupts are generated. If two
or more interrupt requests, each having the same priority, are simultaneously generated, then they are processed
according to the priority of vectored interrupt servicing. For the priority order, see Table 19-1.
A standby release signal is generated and STOP and HALT modes are released.
External interrupt requests and internal interrupt requests are provided as maskable interrupts.
(2) Software interrupt
This is a vectored interrupt generated by executing the BRK instruction. It is acknowledged even when interrupts are
disabled. The software interrupt does not undergo interrupt priority control.
R01UH0004EJ0501 Rev.5.01
740
Jun 20, 2011