Renesas R5S72621 User Manual
Section 7 Interrupt Controller
Page 172 of 2108
R01UH0134EJ0400 Rev. 4.00
Sep
24,
2014
SH7262 Group, SH7264 Group
7.3.9
Bank Number Register (IBNR)
IBNR is a 16-bit register that enables or disables use of register banks and register bank overflow
exception. IBNR also indicates the bank number to which saving is performed next through the
bits BN3 to BN0.
exception. IBNR also indicates the bank number to which saving is performed next through the
bits BN3 to BN0.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
Bit:
Initial value:
R/W:
BE[1:0]
BOVE
-
-
-
-
-
-
-
-
-
BN[3:0]
Bit Bit
Name
Initial
Value R/W
Value R/W
Description
15, 14
BE[1:0]
00
R/W
Register Bank Enable
These bits enable or disable use of register banks.
00: Use of register banks is disabled for all interrupts.
The setting of IBCR is ignored.
01: Use of register banks is enabled for all interrupts
except NMI. The setting of IBCR is ignored.
10: Reserved (setting prohibited)
11: Use of register banks is controlled by the setting of
IBCR.
13
BOVE
0
R/W
Register Bank Overflow Enable
Enables of disables register bank overflow exception.
0: Generation of register bank overflow exception is
disabled
1: Generation of register bank overflow exception is
enabled
12 to 4
All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
always be 0.
3 to 0
BN[3:0]
0000
R
Bank Number
These bits indicate the bank number to which saving is
performed next. When an interrupt using register banks
is accepted, saving is performed to the register bank
indicated by these bits, and BN is incremented by 1.
After BN is decremented by 1 due to execution of a
RESBANK (restore from register bank) instruction,
restoration from the register bank is performed.
performed next. When an interrupt using register banks
is accepted, saving is performed to the register bank
indicated by these bits, and BN is incremented by 1.
After BN is decremented by 1 due to execution of a
RESBANK (restore from register bank) instruction,
restoration from the register bank is performed.