參數(shù)資料
型號： M3455AG8FP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP52
封裝： 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52
文件頁數(shù)： 75/150頁
文件大小： 1818K
代理商： M3455AG8FP
Rev.1.02
Nov 26, 2008
Page 28 of 146
REJ03B0224-0102
455A Group
(1) External 0 interrupt request flag (EXF0)
External 0 interrupt request flag (EXF0) is set to “1” when a
valid waveform is input to D5/INT pin.
The valid waveforms causing the interrupt must be retained at
their level for 4 clock cycles or more of the system clock (Refer
The state of EXF0 flag can be examined with the skip instruction
(SNZ0). Use the interrupt control register V1 to select the
interrupt or the skip instruction. The EXF0 flag is cleared to “0”
when an interrupt occurs or when the next instruction is skipped
with the skip instruction.
External 0 interrupt activated condition
External 0 interrupt activated condition is satisfied when a
valid waveform is input to D5/INT pin.
The valid waveform can be selected from rising waveform,
falling waveform or both rising and falling waveforms. An
example of how to use the external 0 interrupt is as follows.
(1) Set the bit 3 of register I1 to “1” for the INT pin to be in the
input enabled state.
(2) Select the valid waveform with the bits 1 and 2 of register
I1.
(3) Clear the EXF0 flag to “0” with the SNZ0 instruction.
(4) Set the NOP instruction for the case when a skip is
performed with the SNZ0 instruction.
(5) Set both the external 0 interrupt enable bit (V10) and the
INTE flag to “1.”
The external 0 interrupt is now enabled. Now when a valid
waveform is input to the D5/INT pin, the EXF0 flag is set to “1”
and the external 0 interrupt occurs.
(2) External interrupt control registers
(1) Interrupt control register I1
Register I1 controls the valid waveform for the external 0
interrupt. Set the contents of this register through register A
with the TI1A instruction. The TAI1 instruction can be used
to transfer the contents of register I1 to register A.
Note 1.“R” represents read enabled, and “W” represents write enabled.
Note 2.When the contents of I12 and I13 are changed, the external interrupt request flag EXF0 may be set.
Table 15 External interrupt control register
Interrupt control register I1
at reset : 00002
at power down : state retained
R/W
TAI1/TI1A
I13
INT pin input control bit (Note 2)
0
INT pin input disabled
1
INT pin input enabled
I12
Interrupt valid waveform for INT pin/
return level selection bit (Note 2)
0
Falling waveform (“L” level of INT pin is recognized with the SNZI0
instruction)/“L” level
1
Rising waveform (“H” level of INT pin is recognized with the SNZI0
instruction)/“H” level
I11
INT pin edge detection circuit control bit
0
One-sided edge detected
1
Both edges detected
I10
INT pin timer 1 count start synchronous cir-
cuit selection bit
0
Timer 1 count start synchronous circuit not selected
1
Timer 1 count start synchronous circuit selected
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