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參數(shù)資料
| 型號(hào)： | M37733MHB |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī)) |
| 中文描述： | 單片微機(jī)16位的CMOS（16位單片機(jī)） |
| 文件頁數(shù)： | 15/89頁 |
| 文件大?。?/td> | 1992K |
| 代理商： | M37733MHB |
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15
MITSUBISHI MICROCOMPUTERS
M37733MHBXXXFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
By setting the port function control register, the
INT
2
/Key input interrupt
function can be switched to the key input interrupt function which
uses the
KI
0
to
KI
3
inputs. Figure 11 shows the bit configuration of the
port function control register, and Figure 12 shows the
INT
2
/Key input
interrupt input circuit block diagram.
When the key input interrupt selection bit of the port function control
register is “0”, a signal is input from the
INT
2
pin to the
INT
2
/Key input
interrupt control circuit and the
INT
2
interrupt is normally performed.
When the key input interrupt selection bit is “1”, signals input from
the
KI
0
to
KI
3
pins are inverted, and then the logical sum of these
signals is input to the
INT
2
interrupt control circuit. In this case, the
external interrupt which uses the
KI
0
to
KI
3
pins is performed. (Pins
KI
0
to
KI
3
correspond to ports P5
4
to P5
7
, respectively.) Additionally,
by setting the port P6 pull-up selection bit 1 to “1”, the
INT
2
input is
added to that logical sum, so that the external interrupt which uses
the inputs
KI
0
to
KI
3
and
INT
2
is performed. When using the key input
interrupt, it is necessary to select the edge sense which uses the
falling edge by setting the
INT
2
/Key input interrupt control register.
Because of this selection, a key input interrupt request occurs when
“L” is input to one of the
KI
0
to
KI
3
and
INT
2
pins. The interrupt vector
and the interrupt control register are common to the
INT
2
and key
input interrupts.
Pull-up resistors (transistors) can be added to the
KI
0
to
KI
3
pins by
setting “1” to the port P5 pull-up selection bit and “0” to the contents
of the port P5
i
(i = 4 to 7) direction register. Similarly, a pull-up resistor
can be added to the
INT
2
pin by setting “1” to the port P6 pull-up
selection bit 1 and “0” to the content of the port P6
4
direction register.
With the key input interrupt and the pull-up function, the key input
circuit is easily composed.
Fig. 12
INT
2
/Key input interrupt input circuit block diagram
INT
2
/Key input
interrupt control register
Interrupt control register
P6
4
/
INT
2
P5
7
/
KI
3
P5
5
/
KI
1
P5
6
/
KI
2
P5
4
/
KI
0
INT
2
/Key input
interrupt request
Key input interrupt selection bit
(Address 7F
16
)
When the key input interrupt is
selected, it is necessary to
select the edge sense which
uses falling edge.
Pull–up
transistor
Port P5 pull-up
selection bit
Port P5
7
direction
register
0
1
Pull–up
transistor
Pull–up
transistor
Pull–up
transistor
Port P6 pull-up
selection bit 1
Port P6
4
direction register
1
0
Port P6 pull-up
selection bit 1
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