Hitachi F-ZTAT H8/3039 Series Hardware Manual page 100

Bit 1—Priority Level A1 (IPRA1): Selects the priority level of ITU channel 1 interrupt requests.
Bit1
IPRA1 Description
0 ITU channel 1 interrupt requests have priority level 0 (low priority)
1 ITU channel 1 interrupt requests have priority level 1 (high priority)
Bit 0—Priority Level A0 (IPRA0): Selects the priority level of ITU channel 2 interrupt requests.
Bit0
IPRA0 Description
0 ITU channel 2 interrupt requests have priority level 0 (low priority)
1 ITU channel 2 interrupt requests have priority level 1 (high priority)
88
(Initial value)
(Initial value)