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3. Interrupt Control Circuit
3.4 Maskable Interrupt Priority Change Function
TMP89FM42
RA003
3.4
Maskable Interrupt Priority Change Function
The priority of maskable interrupts (IL4 to IL25) can be changed to four levels, Levels 0 to 3, regardless of the
basic priorities 5 to 26. Interrupt priorities can be changed by the interrupt priority change control register (ILPRS1
to ILPRS6). To raise the interrupt priority, set the Level to a larger number. To lower the interrupt priority, set the
Level to a smaller number. When different maskable interrupts are generated simultaneously at the same level, the
interrupt with higher basic priority is processed preferentially. For example, when the ILPRS1 register is set to 0xC0
and interrupts IL4 and IL7 are generated at the same time, IL7 is preferentially processed (provided that EF4 and
EF7 have been enabled).
After reset is released, all maskable interrupts are set to priority level 0 (the lowest priority).
Note: In the main program, before manipulating the interrupt priority change control register (ILPRS1 to 6), be sure to
clear the master enable flag (IMF) to "0" (Disable interrupt by DI instruction).
Set the IMF to "1" as required after operating ILPRS1 to 6 (Enable interrupt by EI instruction).
In the interrupt service routine, the IMF becomes "0" automatically and need not be cleared to "0" normally. How-
ever, if using multiple interrupt in the interrupt service routine, manipulate ILPRS1 to 6 before setting the IMF to "1".
Interrupt priority change control register 1
ILPRS1
7
6
5
4
3
2
1
0
(0x0FF0)
Bit Symbol
IL07P
IL06P
IL05P
IL04P
Read/Write
R/W
R/W
R/W
R/W
After reset
0
0
0
0
0
0
0
0
IL07P
Sets the interrupt priority of IL7.
00:
Level 0 (lower priority)
IL06P
Sets the interrupt priority of IL6.
01:
Level 1
IL05P
Sets the interrupt priority of IL5.
10:
Level 2
IL04P
Sets the interrupt priority of IL4.
11:
Level 3 (higher priority)
Interrupt priority change control register 2
ILPRS2
7
6
5
4
3
2
1
0
(0x0FF1)
Bit Symbol
IL11P
IL10P
IL09P
IL08P
Read/Write
R/W
R/W
R/W
R/W
After reset
0
0
0
0
0
0
0
0
IL11P
Sets the interrupt priority of IL11.
00:
Level 0 (lower priority)
IL10P
Sets the interrupt priority of IL10.
01:
Level 1
IL09P
Sets the interrupt priority of IL9.
10:
Level 2
IL08P
Sets the interrupt priority of IL8.
11:
Level 3 (higher priority)
Interrupt priority change control register 3
ILPRS3
7
6
5
4
3
2
1
0
(0x0FF2)
Bit Symbol
IL15P
IL14P
IL13P
IL12P
Read/Write
R/W
R/W
R/W
R/W
After reset
0
0
0
0
0
0
0
0
IL15P
Sets the interrupt priority of IL15.
00:
Level 0 (lower priority)
IL14P
Sets the interrupt priority of IL14.
01:
Level 1
IL13P
Sets the interrupt priority of IL13.
10:
Level 2
IL12P
Sets the interrupt priority of IL12.
11:
Level 3 (higher priority)
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: ......