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| 型號： | M38B7 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 8 Bits Microcomputer(8位單片機) |
| 中文描述： | 單芯片8位單片機（8位單片機） |
| 文件頁數(shù)： | 65/109頁 |
| 文件大小： | 1555K |
| 代理商： | M38B7 |
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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
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INTERRUPT INTERVAL DETERMINATION FUNCTION
The 38B7 group has an interrupt interval determination circuit.
This interrupt interval determination circuit has an 8-bit binary up
counter. Using this counter, it determines a duration of time from
the rising edge (falling edge) of an input signal pulse on the P7
2
/
INT
2
pin to the rising edge (falling edge) of the signal pulse that is
input next.
How to determine the interrupt interval is described below.
1. Enable the INT
2
interrupt by setting bit 2 of the interrupt control
register 1 (address 003E
16
). Select the rising interval or falling
interval by setting bit 2 of the interrupt edge selection register
(address 003A
16
).
2. Set bit 0 of the interrupt interval determination control register
(address 0031
16
) to
“
1
”
(interrupt interval determination operat-
ing).
3. Select the sampling clock of 8-bit binary up counter by setting
bit 1 of the interrupt interval determination control register.
4. When the signal of polarity which is set on the INT
2
pin (rising
or falling edge) is input, the 8-bit binary up counter starts count-
ing up of the selected counter sampling clock.
5. When the signal of polarity selected above is input again, the
value of the 8-bit binary up counter is transferred to the inter-
rupt interval determination register (address 0030
16
), and the
remote control interrupt request occurs. Immediately after that,
the 8-bit binary up counter continues to count up again from
“
00
16
”
.
6. When count value reaches
“
FF
16
”
, the 8-bit binary up counter
stops counting up. Then, simultaneously when the next counter
sampling clock is input, the counter sets value
“
FF
16
”
to the in-
terrupt interval determination register to generate the counter
overflow interrupt request.
Fig. 68 Interrupt interval determination circuit block diagram
Noise Filter
The P7
2
/INT
2
pin builds in the noise filter.
The noise filter operation is described below.
1. Select the sampling clock of the input signal with bits 2 and 3 of
the interrupt interval determination control register. When not
using the noise filter, set
“
00
16
”
.
2. The P7
2
/INT
2
input signal is sampled in synchronization with
the selected clock. When sampling the same level signal in a
series of three sampling, the signal is recognized as the inter-
rupt signal, and the interrupt request occurs.
When setting bit 4 of interrupt interval determination control regis-
ter to
“
1
”
, the interrupt request can occur at both rising and falling
edges.
When using the noise filter, set the minimum pulse width of the
INT
2
input signal to 3 cycles or more of the sample clock.
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