HD64F3694HV Datasheet, PDF (88/452 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 3 Exception Handling
RES
Reset cleared
Initial program
Vector fetch Internal ^{instruction prefetch}
processing
φ
Internal
address bus
Internal read
signal
Internal write
signal
Internal data
bus (16 bits)
(1)
(2)
(2)
(3)
(1) Reset exception handling vector address (H'0000)
(2) Program start address
(3) Initial program instruction
Figure 3.1 Reset Sequence
3.4.2 Internal Interrupts
Each on-chip peripheral module has a flag to show the interrupt request status and the enable bit to
enable or disable the interrupt. For timer A interrupt requests and direct transfer interrupt requests
generated by execution of a SLEEP instruction, this function is included in IRR1 and IENR1.
When an on-chip peripheral module requests an interrupt, the corresponding interrupt request
status flag is set to 1, requesting the CPU of an interrupt. These interrupts can be masked by
writing 0 to clear the corresponding enable bit.
3.4.3 Interrupt Handling Sequence
Interrupts are controlled by an interrupt controller.
Interrupt operation is described as follows.
1. If an interrupt occurs while the NMI or interrupt enable bit is set to 1, an interrupt request
signal is sent to the interrupt controller.
Rev.5.00 Nov. 02, 2005 Page 58 of 418
REJ09B0028-0500