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參數(shù)資料
| 型號： | TMP86PM74AFG |
| 廠商： | Toshiba Corporation |
| 英文描述： | Zener Diode; Application: General; Pd (mW): 500; Vz (V): 6.3 to 6.6; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35 |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 50/190頁 |
| 文件大?。?/td> | 1557K |
| 代理商： | TMP86PM74AFG |
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Page 40
3. Interrupt Control Circuit
3.4 Interrupt Sequence
TMP86PM74AFG
Note 1: a: Return address entry address, b: Entry address, c: Address which RETI instruction is stored
Note 2: On condition that interrupt is enabled, it takes 38/fc [s] or 38/fs [s] at maximum (If the interrupt latch is set at the first
machine cycle on 10 cycle instruction) to start interrupt acceptance processing since its interrupt latch is set.
Figure 3-1 Timing Chart of Interrupt Acceptance/Return Interrupt Instruction
Example: Correspondence between vector table address for INTTBT and the entry address of the interrupt
service program
Figure 3-2 Vector table address,Entry address
A maskable interrupt is not accepted until the IMF is set to “1” even if the maskable interrupt higher than the
level of current servicing interrupt is requested.
In order to utilize nested interrupt service, the IMF is set to “1” in the interrupt service program. In this case,
acceptable interrupt sources are selectively enabled by the individual interrupt enable flags.
To avoid overloaded nesting, clear the individual interrupt enable flag whose interrupt is currently serviced,
before setting IMF to “1”. As for non-maskable interrupt, keep interrupt service shorten compared with length
between interrupt requests; otherwise the status cannot be recovered as non-maskable interrupt would simply
nested.
3.4.2
Saving/restoring general-purpose registers
During interrupt acceptance processing, the program counter (PC) and the program status word (PSW,
includes IMF) are automatically saved on the stack, but the accumulator and others are not. These registers are
saved by software if necessary. When multiple interrupt services are nested, it is also necessary to avoid using
the same data memory area for saving registers. The following methods are used to save/restore the general-
purpose registers.
3.4.2.1
Using PUSH and POP instructions
If only a specific register is saved or interrupts of the same source are nested, general-purpose registers
can be saved/restored using the PUSH/POP instructions.
Example :Save/store register using PUSH and POP instructions
PINTxx:
PUSH
WA
; Save WA register
(interrupt processing)
POP
WA
; Restore WA register
RETI
; RETURN
D2H
03H
D203H
D204H
06H
Vector table address
Entry address
0FH
Vector
Interrupt
service
program
FFF0H
FFF1H
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相關代理商/技術參數(shù) |
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| TMP86PS23UG | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:8 Bit Microcontroller |
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