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5CL8
Figure 3-4 Saving/Restoring General-purpose Registers under Interrupt Processing
3.3.3 Interrupt return
Interrupt return instructions [RETI]/[RETN] perform as follows.
As for address trap interrupt (INTATRAP), it is required to alter stacked data for program counter (PC) to
restarting address, during interrupt service program.
Note:If [RETN] is executed with the above data unaltered, the program returns to the address trap area and
INTATRAP occurs again.When interrupt acceptance processing has completed, stacked data for PCL and
PCH are located on address (SP + 1) and (SP + 2) respectively.
Example :Save/store register using data transfer instructions
PINTxx:
LD
(GSAVA), A
; Save A register
(interrupt processing)
LD
A, (GSAVA)
; Restore A register
RETI
; RETURN
[RETI]/[RETN] Interrupt Return
1. Program counter (PC) and program status word
(PSW, includes IMF) are restored from the stack.
2. Stack pointer (SP) is incremented by 3.
Example 1 :Returning from address trap interrupt (INTATRAP) service program
PINTxx:
POP
WA
; Recover SP by 2
LD
WA, Return Address
;
PUSH
WA
; Alter stacked data
(interrupt processing)
RETN
; RETURN
Interrupt
acceptance
Interrupt
service task
Restoring
registers
Saving
registers
Interrupt return
Saving/Restoring general-purpose registers using PUSH/POP data transfer instruction
Main task
Содержание CEM2100/00
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Страница 19: ...PCB LAYOUT SD BOARD TOP SIDE VIEW ...
Страница 20: ...20 PCB LAYOUT CD CONNECTOR TOP SIDE VIEW ...
Страница 21: ...PCB LAYOUT ISO BOARD BOTTOM SIDE VIEW 21 ...
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Страница 113: ...Revision History Date Revision 2008 7 31 1 First Release ...
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Страница 126: ...Page 4 1 3 Block Diagram T5CL8 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 130: ...Page 8 1 4 Pin Names and Functions T5CL8 ...
Страница 155: ...Page 33 T5CL8 ...
Страница 156: ...Page 34 2 Operational Description 2 3 Reset Circuit T5CL8 ...
Страница 186: ...Page 64 5 I O Ports 5 8 Port P7 P77 to P70 T5CL8 ...
Страница 194: ...Page 72 6 Watchdog Timer WDT 6 3 Address Trap T5CL8 ...
Страница 214: ...Page 92 8 16 Bit TimerCounter 1 TC1 8 3 Function T5CL8 ...
Страница 270: ...Page 148 12 Asynchronous Serial interface UART1 12 9 Status Flag T5CL8 ...
Страница 280: ...Page 158 13 Asynchronous Serial interface UART2 13 9 Status Flag T5CL8 ...
Страница 332: ...Page 210 16 Serial Bus Interface I2C Bus Ver D SBI 16 6 Data Transfer of I2C Bus T5CL8 ...
Страница 342: ...Page 220 17 10 bit AD Converter ADC 17 6 Precautions about AD Converter T5CL8 ...
Страница 354: ...Page 232 19 Flash Memory 19 4 Access to the Flash Memory Area T5CL8 ...
Страница 388: ...Page 266 21 Input Output Circuit 21 2 Input Output Ports T5CL8 ...
Страница 397: ...Page 275 T5CL8 23 Package Dimensions LQFP64 P 1010 0 50D Rev 01 Unit mm ...
Страница 398: ...Page 276 23 Package Dimensions T5CL8 ...
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Страница 428: ...TC94B14MFG 2010 01 12 28 Package LQFP80 P 1212 0 50F Weight 0 6 g Typical ...