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參數(shù)資料
| 型號： | S1C60L02 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.08 MHz, MICROCONTROLLER, PQFP60 |
| 文件頁數(shù)： | 35/102頁 |
| 文件大?。?/td> | 674K |
| 代理商： | S1C60L02 |
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30
EPSON
S1C60N02 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Ports)
When reading data
When "1" is read:
High level
When "0" is read:
Low level
The pin voltage level of the I/O port is read. When the I/
O port is in the input mode the voltage level being input
to the port pin can be read; in the output mode the
output voltage level can be read. When the pin voltage is
high (VDD) the port data read is "1", and when the pin
voltage is low (VSS) the data is "0". Also, the built-in pull-
down resistance functions during reading, so the I/O port
pin is pulled down.
-
When the I/O port is set to the output mode and a low-imped-
ance load is connected to the port pin, the data written to the
register may differ from the data read.
-
When the I/O port is set to the input mode and a low-level
voltage (Vss) is input by the built-in pull-down resistance, an
erroneous input results if the time constant of the capacitive
load of the input line and the built-in pull-down resistance load is
greater than the read-out time. When the input data is being
read, the time that the input line is pulled down is equivalent to
0.5 cycles of the CPU system clock. Hence, the electric poten-
tial of the pins must settle within 0.5 cycles. If this condition
cannot be met, some measure must be devised, such as
arranging a pull-down resistance externally, or performing
multiple read-outs.
I/O control register (0FCH D0)
The input or output I/O port mode can be set with this
register.
When "1" is written:
Output mode
When "0" is written:
Input mode
Reading:
Valid
The input or output mode of the I/O port is set in units of
four bits. For instance, IOC sets the mode for P00–P03.
Writing "1" to the I/O control register makes the I/O port
enter the output mode, and writing "0", the input mode.
After an initial reset, the IOC register is set to "0", so the I/O
port is in the input mode.
Note
IOC
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| S1C60L05 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
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| S1C60L16 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
| S1C60N05 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
| S1C60N08 | 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer |
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