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參數(shù)資料
| 型號： | M37478M8 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 25/47頁 |
| 文件大小： | 669K |
| 代理商： | M37478M8 |
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25
MITSUBISHI MICROCOMPUTERS
7477/7478 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
I/O PORTS
(1) Port P0
Port P0 is an 8-bit I/O port with CMOS outputs. As shown in
Figure 2, P0 can be accessed as memory through zero page
address 00C0
16
. Port P0’s direction register allows each bit to
be programmed individually as input or output. The direction
register (zero page address 00C1
16
) can be programmed as
input with “0”, or as output with “1”. When in the output mode,
the data to be output is latched to the port latch and output.
When data is read from the output port, the output pin level is
not read, only the latched data of the port latch is read.
Therefore, a previously output value can be read correctly
even though the output voltage level has been shifted up or
down. Port pins set as input are in the high impedance state
so the signal level can be read. When data is written into the
input port, the data is latched only to the output latch and the
pin still remains in the high impedance state. Following the
execution of STP or WIT instruction, key matrix with port P0
can be used to generate the interrupt to bring the microcom-
puter back in its normal state. When this port is selected for
input, pull-up transistor can be connected in units of 1-bit.
(2) Port P1
Port P1 has the same function as port P0. P1
2
– P1
7
serve
dual functions, and the desired function can be selected by
the program. When this port is selected for input, pull-up tran-
sistor can be connected in units of 4-bit.
(3) Port P2
Port P2 is an 8-bit input port. In the 7477 group, this port is
P2
0
– P2
3
, a 4-bit input port. This port can also be used as
the analog voltage input pins.
(4) Port P3
Port P3 is a 4-bit input port.
(5) Port P4
Port P4 is a 4-bit I/O port and has basically the same func-
tions as port P0. In the 7477 group, this port is P4
0
and P4
1
,
a 2-bit I/O port. When this port is selected for input, pull-up
transistor can be connected in units of 4-bit .
(6) Port P5
Port P5 is a 4-bit input port and pull-up transistor can be con-
nected in units of 4-bit. P5
0
and P5
1
are shared with clock
generating circuit input/output pins.
The 7477 group does not have this port.
(7) INT
0
pin (P3
0
/INT
0
pin)
This is an interrupt input pin, and is shared with port P3
0
.
When “H” to “L” or “L” to “H” transition input is applied to this
pin, the INT
0
interrupt request bit (bit 0 of address 00FD
16
) is
set to “1”.
(8) INT
1
pin (P3
1
/INT
1
pin)
This is an interrupt input pin, and is shared with port P3
1
.
When “H” to “L” or “L” to “H” transition input is applied to this
pin, the INT
1
interrupt request bit (bit 1 of address 00FD
16
) is
set to “1”.
(9) Counter input CNTR
0
pin (P3
2
/CNTR
0
pin)
This is a timer input pin, and is shared with port P3
2
.
When this pin is selected to CNTR
0
or CNTR
1
interrupt input
pin and “H” to “L” or “L” to “H” transition input is applied to this
pin, the CNTR
0
or CNTR
1
interrupt request bit (bit 2 of ad-
dress 00FD
16
) is set to “1”.
(10) Counter input CNTR
1
pin (P3
3
/CNTR
1
pin)
This is a timer input pin, and is shared with port P3
3
.
When this pin is selected to CNTR
0
or CNTR
1
interrupt input
pin and “H” to “L” or “L” to “H” transition input is applied to this
pin, the CNTR
0
or CNTR
1
interrupt request bit (bit 2 of ad-
dress 00FD
16
) is set to “1”.
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| M37477 | Single Chip 8 Bits CMOS Microcomputer(8位單片機(jī)) |
| M37478 | Single Chip 8 Bits CMOS Microcomputer(8位單片機(jī)) |
| M37477E8SP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37477M4-2214FP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37478M8TXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37478M8TXXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37478M8TXXXSP/FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37478M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37478M8-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
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