Hitachi H8/3048 Hardware Manual page 104

Bit 7—Priority Level B7 (IPRB7): Selects the priority level of ITU channel 3 interrupt requests.
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Bit 7
IPRB7 Description
0 ITU channel 3 interrupt requests have priority level 0 (low priority)
1 ITU channel 3 interrupt requests have priority level 1 (high priority)
Bit 6—Priority Level B6 (IPRB6): Selects the priority level of ITU channel 4 interrupt requests.
Bit 6
IPRB6 Description
0 ITU channel 4 interrupt requests have priority level 0 (low priority)
1 ITU channel 4 interrupt requests have priority level 1 (high priority)
Bit 5—Priority Level B5 (IPRB5): Selects the priority level of DMAC interrupt requests
(channels 0 and 1).
Bit 5
IPRB5 Description
0 DMAC interrupt requests (channels 0 and 1) have priority level 0
(low priority)
1 DMAC interrupt requests (channels 0 and 1) have priority level 1 (high priority)
Bit 4—Reserved: This bit can be written and read, but it does not affect interrupt priority.
90
(Initial value)
(Initial value)
(Initial value)