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| 型號(hào)： | M34571G6FP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO24 |
| 封裝： | 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁(yè)數(shù)： | 45/126頁(yè) |
| 文件大小： | 1776K |
| 代理商： | M34571G6FP |
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Rev.1.02
May 25, 2007
Page 25 of 124
REJ03B0179-0102
4571 Group
(4) Bit 3 of register I2
When the input of the P21/INT1 pin is controlled with the
bit 3 of register I2 in software, be careful about the
following notes.
Depending on the input state of the P21/INT1 pin, the external
1 interrupt request flag (EXF1) may be set when the bit 3 of
register I2 is changed. In order to avoid the occurrence of an
unexpected interrupt, clear the bit 1 of register V1 to “0” (refer
to (1) in Figure 27) and then, change the bit 3 of register I2.
In addition, execute the SNZ1 instruction to clear the EXF1
flag to “0” after executing at least one instruction (refer to (2)
in Figure 27).
Also, set the NOP instruction for the case when a skip is
performed with the SNZ1 instruction (refer to (3) in Figure
27).
Fig 27. External 1 interrupt program example-1
(5) Bit 3 of register I2
When the bit 3 of register I2 is cleared to “0”, the RAM
back-up mode is selected and the input of INT1 pin is
disabled, be careful about the following notes.
When the INT1 pin input is disabled (register I23 = “0”), set
the key-on wakeup of INT1 pin to be invalid (register L20 =
“0”) before system enters to the RAM back-up mode. (refer to
(1) in Figure 28)
.
Fig 28. External 1 interrupt program example-2
(6) Bit 2 of register I2
When the interrupt valid waveform of the P21/INT1 pin is
changed with the bit 2 of register I2 in software, be careful
about the following notes.
Depending on the input state of the P21/INT1 pin, the external
1 interrupt request flag (EXF1) may be set when the bit 2 of
register I2 is changed. In order to avoid the occurrence of an
unexpected interrupt, clear the bit 1 of register V1 to “0” (refer
to (1) in Figure 29) and then, change the bit 2 of register I2 is
changed.
In addition, execute the SNZ1 instruction to clear the EXF1
flag to “0” after executing at least one instruction (refer to (2)
in Figure 29).
Also, set the NOP instruction for the case when a skip is
performed with the SNZ1 instruction (refer to (3) in Figure
29).
Fig 29. External 1 interrupt program example-3
LA
4
; (
××0×2)
TV1A
; The SNZ1 instruction is valid ...... (1)
LA
8
; (1
×××2)
TI1A
; Control of INT1 pin input is changed
NOP
...................................................... (2)
SNZ0
; The SNZ1 instruction is executed
(EXF1 flag cleared)
NOP
...................................................... (3)
×: these bits are not used here.
LA
0
; (
×0××2)
TL1A
; INT1 key-on wakeup disabled .....(1)
DI
EPOF
POF
; RAM back-up
×: these bits are not used here.
LA
4
; (
××0×2)
TV1A
; The SNZ1 instruction is valid ......(1)
LA
12
; (1
×××2)
TI1A
; Interrupt valid waveform is changed
NOP
.......................................................(2)
SNZ0
; The SNZ1 instruction is executed
(EXF1 flag cleared)
NOP
.......................................................(3)
×: these bits are not used here.
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|---|---|
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