HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 110

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The CCR is comprised of one byte, but when it is saved to the stack, it is treated as one word of
data. During interrupt processing, two identical bytes of CCR data are saved to the stack to create
one word of data. When the RTE instruction is executed to restore the value from the stack, the
byte located at the even address is loaded into CCR, and the byte located at the odd address is
ignored.
78
PC:
CCR:
SP:
Notes: 1.
SP – 4
SP – 3
SP – 2
SP – 1
SP (R7)
Program counter
Condition code register
Stack pointer
2.
* Ignored on return.
The PC contains the address of the first instruction executed after return.
Registers must be saved and restored by word access at an even address.
Before interrupt
is accepted
Stack area
Figure 4.6 Usage of Stack in Interrupt Handling
Pushed onto stack
SP + 3
SP(R7)
SP + 1
SP + 2
SP + 4
PC (upper byte)
PC (lower byte)
After interrupt
is accepted
CCR *
CCR
Even address