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參數(shù)資料
| 型號： | HD4074318S |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-series microcomputer |
| 中文描述： | 4位HMCS400系列微機 |
| 文件頁數(shù)： | 24/66頁 |
| 文件大?。?/td> | 305K |
| 代理商： | HD4074318S |
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HD404318 Series
24
I/O Ports
The MCU has 33 input/output pins (D
0
–D
8
, R0–R4, R8) and one input-only pin (RA
1
). The following
describes the features of the I/O ports.
The 21 pins consisting of D
0
–D
8
, R1, R2, and R8 are all high-voltage I/O pins. RA
1
is a high-voltage
input-only pin. These high-voltage pins can be equipped with or without pull-down resistance, as
selected by the mask option.
All standard output pins are CMOS output pins. However, the R0
2
/SO pin can be programmed for
NMOS open-drain output.
In stop mode, input/output pins go to the high-impedance state
All standard input/output pins have pull-up MOS built in, which can be individually turned on or off by
software
Table 5
Control of Standard I/O Pins by Program
MIS3 (bit 3 of MIS)
0
1
DCR
0
1
0
1
PDR
0
1
0
1
0
1
0
1
CMOS buffer
PMOS
—
—
—
On
—
—
—
On
NMOS
—
—
On
—
—
—
On
—
Pull-up MOS
Note:
—
—
—
—
—
On
—
On
— indicates off.
Bit
Initial value
Read/Write
Bit name
3
0
W
2
0
W
0
0
W
1
0
W
DCR0, DCR3,
DCR4
Data control register
(DCR0: $030, DCR3: $033, DCR4: $034)
Bits 0 to 3
0
CMOS Buffer Control
CMOS buffer off
(high impedance)
CMOS buffer on
Register
DCR0
DCR3
DCR4
Bit 3
R0
3
R3
3
R4
3
Correspondence between ports and DCR bits
Bit 2
R0
2
R3
2
R4
2
Bit 1
R0
1
R3
1
R4
1
Bit 0
R0
0
R3
0
R4
0
1
DCR03,
DCR33,
DCR43,
DCR02,
DCR32,
DCR42,
DCR01,
DCR31,
DCR41,
DCR00,
DCR30,
DCR40
Figure 17 Data Control Register (DCR)
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