r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 188

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 11.6
The register saving operation, which is performed as part of the interrupt sequence, saved in 8 bits at a time in
four steps.
Figure 11.6 shows the Register Saving Operation.
Address
Note:
[SP]−5
[SP]−4
[SP]−3
[SP]−2
[SP]−1
1.[SP] indicates the SP initial value when an interrupt request is acknowledged.
[SP]
Register Saving Operation
After registers are saved, the SP content is [SP] minus 4.
When an INT instruction for software numbers 32 to 63 has been executed,
this SP is indicated by the U flag. Otherwise it is ISP.
FLGH
Stack
PCM
FLGL
PCL
PCH
Sequence in which registers are saved
Completed saving registers
in four operations
(3)
(4)
(1)
(2)
Saved, 8 bits at a time
PCL
PCM
PCH
FLGL
FLGH
: 8 low-order bits of PC
: 8 middle-order bits of PC
: 4 high-order bits of PC
: 8 low-order bits of FLG
: 4 high-order bits of FLG
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11. Interrupts