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M32C83T Datasheet(PDF) 125 Page - Renesas Technology Corp

Part # M32C83T
Description  16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES
PDF  527 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M32C83T Datasheet(HTML) 125 Page - Renesas Technology Corp

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Page 102
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10. Interrupts
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10.6.6 Saving a Register
In the interrupt sequence, the FLG register and PC are saved to the stack.
After the FLG register is saved to the stack, 16 high-order bits and 16 low-order bits of PC, extended to 32
bits, are saved to the stack. Figure 10.7 shows the stack state before and after an interrupt request is
acknowledged.
Other important registers are saved by program at the beginning of an interrupt service routine. The
PUSHM instruction can save all registers except SP.
Refer to 10.4 High-Speed Interrupt for the high-speed interrupt.
[SP]
SP value before
interrupt is
generated
Stack state before an interrupt request is acknowledged
Address
Stack state after an interrupt request is acknowledged
m-6
m-5
m–4
m–3
m–2
m–1
m
m+1
LSB
MSB
LSB
MSB
Address
The Stack
The Stack
FLGL
PCH
FLGH
Content of
previous stack
Content of
previous stack
Content of
previous stack
Content of
previous stack
PCL
PCM
[SP]
New SP value
m-6
m-5
m–4
m–3
m–2
m–1
m
m+1
0016
Figure 10.7 Stack States
10.6.7 Restoration from Interrupt Routine
When the REIT instruction is executed at the end of an interrupt service routine, the FLG register and PC,
which have been saved to the stack, are automatically restored. The program, executed before an interrupt
request has been acknowledged, starts running again. Refer to 10.4 High-Speed Interrupt for the high-
speed interrupt.
Restore registers saved by program in an interrupt service routine by the POPM instruction or others
before the REIT and FREIT instructions. Register bank is switched back to the bank used prior to the
interrupt sequence by the REIT or FREIT instruction.



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