p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 109

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

4.4
Interrupts are controlled by the interrupt controller. The sources to start interrupt exception
handling are external interrupt sources (NMI, IRQ15 to IRQ0, KIN15 to KIN0, and WUE15 to
WUE0) and internal interrupt sources from the on-chip peripheral modules. NMI is an interrupt
with the highest priority. For details, see section 5, Interrupt Controller.
Interrupt exception handling is conducted as follows:
1. The values in the program counter (PC) and condition code register (CCR) are saved in the
2. A vector address corresponding to the interrupt source is generated, the start address is loaded
4.5
Trap instruction exception handling starts when a TRAPA instruction is executed. Trap instruction
exception handling can be executed at all times in the program execution state.
Trap instruction exception handling is conducted as follows:
1. The values in the program counter (PC) and condition code register (CCR) are saved in the
2. A vector address corresponding to the interrupt source is generated, the start address is loaded
The TRAPA instruction fetches a start address from a vector table corresponding to a vector
number from 0 to 3, as specified in the instruction code.
Table 4.3 shows the status of CCR after execution of trap instruction exception handling.
Table 4.3
Interrupt Control Mode
0
1
stack.
from the vector table to the PC, and program execution starts from that address.
stack.
from the vector table to the PC, and program execution starts from that address.
Interrupt Exception Handling
Trap Instruction Exception Handling
Status of CCR after Trap Instruction Exception Handling
I
Set to 1
Set to 1
Rev. 1.00 Sep. 21, 2006 Page 71 of 658
UI
Retains value prior to execution
Set to 1
CCR
Section 4 Exception Handling
REJ09B0310-0100