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参数资料
| 型号： | M38227M8FP |
| 厂商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 17/78页 |
| 文件大小： | 998K |
| 代理商： | M38227M8FP |
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17
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
I/O PORTS
Direction Registers (ports P2, P4
1
-P4
7
, and
P5-P7)
The 3822 group has 49 programmable I/O pins arranged in seven
I/O ports (ports P0
–
P2, P4
1
–
P4
7
and P5-P7). The I/O ports P2,
P4
1
–
P4
7
and P5-P7 have direction registers which determine the
input/output direction of each individual pin. Each bit in a direction
register corresponds to one pin, and each pin can be set to be in-
put port or output port.
When
“
0
”
is written to the bit corresponding to a pin, that pin be-
comes an input pin. When
“
1
”
is written to that bit, that pin be-
comes an output pin.
If data is read from a pin set to output, the value of the port output
latch is read, not the value of the pin itself. Pins set to input are
floating. If a pin set to input is written to, only the port output latch
is written to and the pin remains floating.
Direction Registers (ports P0 and P1)
Ports P0 and P1 have direction registers which determine the in-
put/output direction of each individual port.
Each port in a direction register corresponds to one port, each port
can be set to be input or output. When
“
0
”
is written to the bit 0 of
a direction register, that port becomes an input port. When
“
1
”
is
written to that port, that port becomes an output port. Bits 1 to 7 of
ports P0 and P1 direction registers are not used.
Ports P3 and P4
0
These ports are only for input.
Pull-up/Pull-down Control
By setting the PULL register A (address 0016
16
) or the PULL reg-
ister B (address 0017
16
), ports except for port P4
0
can control
either pull-down or pull-up (pins that are shared with the segment
output pins for LCD are pull-down; all other pins are pull-up) with
a program.
However, the contents of PULL register A and PULL register B do
not affect ports programmed as the output ports.
Fig. 14 Structure of PULL register A and PULL register B
P0
0
–
P0
7
pull-down
P1
0
–
P1
7
pull-down
P2
0
–
P2
7
pull-up
P3
4
–
P3
7
pull-down
P7
0
, P7
1
pull-up
Not used (return
“
0
”
when read)
P
(
P
U
L
L
L
r
A
e
g
:
i
s
d
t
e
d
r
r
e
A
s
U
L
a
s
0
0
1
6
1
6
)
b
7
b
0
P4
1
–
P4
3
pull-up
P4
4
–
P4
7
pull-up
P5
0
–
P5
3
pull-up
P5
4
–
P5
7
pull-up
P6
0
–
P6
3
pull-up
P6
4
–
P6
7
pull-up
Not used (return
“
0
”
when read)
:
1
:
0
D
E
i
n
s
a
a
b
b
l
e
e
l
P
(
P
U
L
L
L
r
B
e
g
:
i
a
s
t
d
e
d
r
r
B
e
U
L
s
s
0
0
1
7
1
6
)
b7
b
0
Note
: The contents of PULL register A and PULL register B
do not affect ports programmed as the output port.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M38227RFS | 制造商:Renesas Electronics Corporation 功能描述:MCU - Trays |
| M3823 BK001 | 制造商:Alpha Wire Company 功能描述:CBL 30COND 18AWG BLK 1000' |
| M3823 BK002 | 制造商:Alpha Wire Company 功能描述:CBL 30COND 18AWG BLK 500' |
| M3823 BK005 | 制造商:Alpha Wire Company 功能描述:CBL 30COND 18AWG BLK 100' |
| M38234G4FP#U0 | 功能描述:MCU 2/5V 16K 80-QFP QZ-ROM RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 标准包装:250 系列:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI，I²C，UART/USART 外围设备:POR，PWM，WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC（J 形引线） 包装:带卷 (TR) |
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