参数资料
型号: M34570M4-XXXFP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO36
封装: 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-36
文件页数: 11/69页
文件大小: 687K
代理商: M34570M4-XXXFP
16
MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
(7) Interrupt sequence
Interrupts occur only when the respective INTE flag, interrupt
enable bits (V10–V13 and V20–V23), and interrupt request
flags (EXF0, T1F, T2F, T3F) are “1.” The interrupt actually
occurs 2 to 3 machine cycles after the cycle in which all three
conditions are satisfied. The interrupt occurs after 3 machine
cycles only when the three interrupt conditions are satisfied
on execution of instructions other than one-cycle instructions
(Refer to Figure 16).
Fig. 16 Interrupt sequence
Notes 1: The system clock = f(X IN)/4 is selected just after system is released from reset.
2: The address is stacked to the last cycle.
3: This interval of cycles depends on the instruction executed at the time when each
interrupt activated condition is satisfied.
2 to 3 machine cycles
(Notes 2, 3)
Software starts
from interrupt address.
Flag cleared
Interrupt enabled state
EI instruction
execution cycle
Interrupt enable
flag (INTE)
Retaining level for 4 cycles or
more of f(XIN) is necessary.
Interrupt disabled state
Flag
EXF0
Flag
T1F, T2F
T3F
INT pin
External
interrupt
Timer 1,
timer 2,
timer 3
interrupts
Interrupt activated
condition satisfied
T1
T2
T3
T1
T2
T3
T1
T2
T3
1 machine cycle
f(XIN)
System clock=f(X IN)/4 selected
T1
T2
T3
T1
T2
T3
T1
T2
T3
T1
T2
T3
T1
T2
T3
T1
T2
T3
T1
T2
T3
f(XIN)
System clock=f(X IN) selected
q When an interrupt request flag is set after its interrupt is enabled (Note 1)
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