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TMP89FM42
RA003
3.3
Interrupt Enable Register (EIR)
The interrupt enable register (EIR) enables and disables the acceptance of interrupts, except for the non-maskable
interrupts (software interrupt, undefined instruction interrupt and watchdog interrupt). Non-maskable interrupts are
accepted regardless of the contents of the EIR.
The EIR consists of the interrupt master enable flag (IMF) and the individual interrupt enable flags (EF). These
registers are located at addresses 0x003A, 0x003B, 0x003C, 0x003D in the SFR area, and they can be read and writ-
ten by instructions (including read-modify-write instructions such as bit manipulation or operation instructions).
3.3.1
Interrupt master enable flag (IMF)
The interrupt master enable flag (IMF) enables and disables the acceptance of all maskable interrupts. Clear-
ing the IMF to "0" disables the acceptance of all maskable interrupts. Setting the IMF to "1" enables the accep-
tance of the interrupts that are specified by the individual interrupt enable flags.
When an interrupt is accepted, the IMF is stacked and then cleared to "0", which temporarily disables the
subsequent maskable interrupts. After the interrupt service routine is executed, the stacked data, which was the
status before interrupt acceptance, reloaded on the IMF by return interrupt instruction [RETI]/[RETN].
The IMF is located on bit 0 in EIRL (Address: 0x03A in SFR), and can be read and written by instructions.
The IMF is normally set and cleared by [EI] and [DI] instructions respectively. During reset, the IMF is initial-
ized to "0".
3.3.2
Individual interrupt enable flags (EF25 to EF4)
Each of these flags enables and disables the acceptance of its maskable interrupt. Setting the corresponding
bit of an individual interrupt enable flag to "1" enables acceptance of its interrupt, and setting the bit to "0" dis-
ables acceptance.
During reset, all the individual interrupt enable flags are initialized to "0" and no maskable interrupts are
accepted until the flags are set to "1".
Note:In the main program, before manipulating the interrupt enable flag (EF), 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 EF
(Enable interrupt by EI instruction).
In the interrupt service routine, the IMF becomes "0" automatically and need not be cleared to "0" normally.
However, if using multiple interrupt in the interrupt service routine, manipulate the EF before setting the IMF to
"1".
Example: Enables interrupts individually and sets IMF
DI
; IMF
←
0
LDW
:
(EIRL), 0y1110100010100000
;
;
EF15 to EF13, EF11, EF7, EF5
←
1
Note: IMF should not be set.
:
EI
; IMF
←
1
Summary of Contents for TLCS-870/C1 Series
Page 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 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......