HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 156

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

4.6.3
If a repeat loop comprises up to three instructions, neither exceptions nor interrupts are accepted.
If a repeat loop contains four or more instructions, neither exceptions nor interrupts are accepted
during the execution cycle of the first instruction or the last three instructions. If a repeat loop
contains four or more instructions, address errors only are accepted during the execution cycle of
the fourth from last instruction. For more information, see the SH-1/SH-2/SH-DSP Programming
Manual.
138
When RC
When RC = 0
A. All interrupts and address errors are accepted.
B. Address errors only are accepted.
C. No interrupts or address errors are accepted.
(1) One instruction
Start (End):
(4) Four or more instructions
All interrupts and address errors are accepted.
Instructions in Repeat Loops
Start:
End:
Figure 4.1 Interrupt Acceptance Restrictions in Repeat Mode
1
instr0
instr1
:
:
instr n-3
instr n-2
instr n-1
instr n
instr n+1
instr0
instr1
instr2
:
A
B
C
A
A
A or C (on return from instr n)
A
A
B
C
C
C
A
(2) Two instructions
Start:
End:
instr0
instr1
instr2
instr3
A
B
C
C
A
(3) Three instructions
Start:
End:
instr0
instr1
instr2
instr3
instr4
A
B
C
C
C
A