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3. Interrupt Control Circuit
3.5 Interrupt Sequence
TMP89FM42
RA003
3.5.3.2
Using data transfer instructions
To save only a specific register without nested interrupts, data transfer instructions are available.
Figure 3-4 Saving/Restoring General-purpose Registers under Interrupt Processing
3.5.3.3
Using a register bank to save/restore general-purpose registers
In non-multiple interrupt handling, the register bank function can be used to save/restore the general-
purpose registers at a time. The register bank function saves (switches) the general-purpose registers by
executing a register bank manipulation instruction (such as LD RBS,1) at the beginning of an interrupt
service task. It is unnecessary to re-execute the register bank manipulation instruction at the end of the
interrupt service task because executing the RETI instruction makes a return automatically to the register
bank that was being used by the main task according to the content of the PSW.
Note: Two register banks (BANK0 and BANK1) are available. Each bank consists of 8-bit general-purpose
registers (W, A, B, C, D, E, H, and L) and 16-bit general-purpose registers (IX and IY).
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
Example :Saving/restoring registers, using an instruction for transfer with data memory (with the main task using the regis-
ter bank BANK0)
PINTxx:
LD
RBS, 1
; Switches to the register bank BANK1
Interrupt processing
RETI
; RETURN
(Makes a return automatically to BANK0 that
was being used by the main task when the
PSW is restored)
Main task
Interrupt acceptance
Interrupt
service task
Saving
registers
Restoring
registers
Interrupt return
Содержание TLCS-870/C1 Series
Страница 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Страница 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Страница 4: ......
Страница 14: ......
Страница 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Страница 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Страница 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Страница 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Страница 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Страница 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Страница 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Страница 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Страница 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Страница 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Страница 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Страница 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Страница 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Страница 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Страница 336: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 Note 1 Make sure that you set the C register to 0x00 LD FLSCR2 0xD5 ...
Страница 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Страница 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Страница 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Страница 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Страница 406: ...26 Package Dimensions TMP89FM42 ...
Страница 408: ......