h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 91
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 91 of 570
- Download datasheet (5Mb)
4.4
Interrupts are controlled by the interrupt controller. The sources to start interrupt exception
handling are external interrupt sources (NMI and IRQ7 to IRQ0) 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 to 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 to 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 entry 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 begins 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
CCR
UI
Retains value prior to execution
Set to 1
Rev. 2.00, 03/04, page 59 of 534
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