r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 176

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
Figure 11.6
The register saving operation in the interrupt sequence uses four operations, each one of which saves 8 bits.
Figure 11.6 shows the Register Saving Operation.
Note:
1. [SP] indicates the SP initial value when an interrupt request is acknowledged.
After registers are saved, the SP content becomes [SP] minus 4.
When an INT instruction for software interrupts numbered 32 to 63 has been
executed, this SP is the SP specified by the U flag. Otherwise it is ISP.
Preliminary document
Specifications in this document are tentative and subject to change.
Register Saving Operation
Address
[SP] - 5
[SP] - 4
[SP] - 3
[SP] - 2
[SP] - 1
[SP]
MSB
FLGH
Stack
FLGL
PCM
PCL
PCH
LSB
Sequence in which registers are saved
Register saving completed in four operations
(3)
(4)
(1)
(2)
Saved, 8 bits at a time
PCL: Lower 8 bits of PC
PCM: 8 bits in the middle of PC
PCH: Higher 4 bits of PC
FLGL: Lower 8 bits of FLG
FLGH: Higher 4 bits of FLG
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11. Interrupts