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3. Interrupt Control Circuit
3.2 Interrupt Latches (IL25 to IL3)
TMP89FM42
RA003
3.2
Interrupt Latches (IL25 to IL3)
An interrupt latch is provided for each interrupt source, except for a software interrupt and an undefined instruc-
tion execution interrupt. When an interrupt request is generated, the latch is set to "1", and the CPU is requested to
accept the interrupt if its acceptance is enabled. The interrupt latch is cleared to "0" immediately after the interrupt is
accepted. All interrupt latches are initialized to "0" during reset.
The interrupt latches are located at addresses 0x0FE0, 0x0FE1, 0x0FE2, 0x0FE3 in SFR area. Each latch can be
cleared to "0" individually by an instruction. However, IL2 and IL3 interrupt latches cannot be cleared by instruc-
tions.
Do not use any read-modify-write instruction, such as a bit manipulation or operation instruction, because it may
clear interrupt requests generated while the instruction is executed.
Interrupt latches cannot be set to "1" by using an instruction. Writing "1" to an interrupt latch is equivalent to deny-
ing clearing of the interrupt latch, and not setting the interrupt latch.
Since interrupt latches can be read by instructions, the status of interrupt requests can be monitored by software.
Note: In the main program, before manipulating an interrupt latch (IL), be sure to clear the master enable flag (IMF) to "0"
(Disable interrupt by DI instruction). Then set the IMF to "1" as required after operating the IL (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 the IL before setting the IMF to "1".
Example 1: Clears interrupt latches
DI
; IMF
←
0
LD
(ILL), 0y00111111
; IL7 to IL6
←
0
LD
(ILH), 0y11101000
; IL12, IL10 to IL8
←
0
EI
; IMF
←
1
Example 2: Reads interrupt latches
LD
WA, (ILL)
; W
←
ILH, A
←
ILL
Example 3: Tests interrupt latches
TEST
(ILL). 7
; if IL7=1 then jump
JR
F, SSET
;
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: ......