r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 177
r5s72060w200fpv
Manufacturer Part Number
r5s72060w200fpv
Description
32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S72060W200FPV.pdf
(1180 pages)
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5.8.4
There are two register bank exceptions (register bank errors): register bank overflow and register
bank underflow.
(1)
This exception occurs if, after data has been saved to all of the register banks, an interrupt for
which register bank use is allowed is accepted by the CPU, and the BOVE bit in the bank number
register (IBNR) is set to 1. In this case, the bank number bit (BN) value in the bank number
register (IBNR) remains set to the bank count of 15 and saving is not performed to the register
bank.
(2)
This exception occurs if the RESBANK (restore from register bank) instruction is executed when
no data has been saved to the register banks. In this case, the values of R0 to R14, GBR, MACH,
MACL, and PR do not change. In addition, the bank number bit (BN) value in the bank number
register (IBNR) remains set to 0.
5.8.5
When a register bank error occurs, register bank error exception handling starts. When this
happens, the CPU operates as follows:
1. The exception service routine start address which corresponds to the register bank error that
2. The status register (SR) is saved to the stack.
3. The program counter (PC) is saved to the stack. The PC value saved is the start address of the
4. Program execution starts from the exception service routine start address.
occurred is fetched from the exception handling vector table.
instruction to be executed after the last executed instruction for a register bank overflow, and
the start address of the executed RESBANK instruction for a register bank underflow. To
prevent multiple interrupts from occurring at a register bank overflow, the interrupt priority
level that caused the register bank overflow is written to the interrupt mask level bits (I3 to I0)
of the status register (SR).
Register Bank Overflow
Register Bank Underflow
Register Bank Exception
Register Bank Error Exception Handling
Rev. 2.00 Dec. 09, 2005 Page 153 of 1152
Section 5 Interrupt Controller (INTC)
REJ09B0191-0200
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