Renesas H8/3847R Series Hardware Manual page 141

Bit 6: SCI1 interrupt request flag (IRRS1)
Bit 6
IRRS1 Description
0 Clearing condition:
When IRRS1 = 1, it is cleared by writing 0
1 Setting condition:
When SCI1 completes transfer
Bit 5: Reserved bit
Bit 5 is reserved; it is always read as 1 and cannot be modified.
Bits 4 to 0: IRQ to IRQ
4
Bit n
IRRIn Description
0 Clearing condition:
When IRRIn = 1, it is cleared by writing 0
1 Setting condition:
When pin IRQn is designated for interrupt input and the designated
signal edge is input
5. Interrupt Request Register 2 (IRR2)
Bit 7
IRRDT
Initial value 0
R/(W) *
Read/Write
Note: * Only a write of 0 for flag clearing is possible
IRR2 is an 8-bit read/write register, in which a corresponding flag is set to 1 when a direct
transfer, A/D converter, Timer G, Timer FH, Timer FC, or Timer C interrupt is requested. The
flags are not cleared automatically when an interrupt is accepted. It is necessary to write 0 to clear
each flag.
interrupt request flags (IRRI4 to IRRI0)
0
6 5
IRRAD —
0 0
R/(W) *
R/W
Section 3 Exception Handling
4 3
IRRTG IRRTFH IRRTFL
0 0
R/(W) * R/(W) * R/(W) *
Rev. 6.00 Aug 04, 2006 page 103 of 680
(initial value)
(initial value)
(n = 4 to 0)
2 1 0
IRRTC IRREC
0 0 0
R/(W) * R/(W) *
REJ09B0145-0600