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參數(shù)資料
| 型號(hào)： | S1C6S460D |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 2 MHz, MICROCONTROLLER, UUC124 |
| 封裝： | 4.69 X 4.68 MM, DIE-124 |
| 文件頁(yè)數(shù)： | 39/107頁(yè) |
| 文件大小： | 788K |
| 代理商： | S1C6S460D |
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S1C6S460 TECHNICAL MANUAL
EPSON
29
CHAPTER 6: INPUT/OUTPUT PORTS
CHAPTER
6INPUT/OUTPUT PORTS
6.1 Input Ports (Kxx)
6.1.1 Configuration of input ports
The S1C6S460 has 8 bits (4 bits
× 2, K00–K03, K10–K13) general input ports built-in.
Figure 6.1.1.1 shows the configuration of the input port.
VDD
VSS
K
Interrupt
request
Data
bus
Address
Mask option
Fig. 6.1.1.1 Configuration of input port
The input port pin K03 is used as the clock input pins for the programmable timer. See "8.3 Program-
mable Timer" for details.
6.1.2 Mask option
The input ports (K00–K03 and K10–K13) are provided with built-in pull up resistor the use of which may
be selected for every bit with the mask option.
Selection of "Pull up resistor enable" with the mask option suits input from the push switch, key matrix,
and so forth. When changing the input port from low level to high level with a pull up resistor, a delay in
the waveform rise time will occur depending on the time constant of the pull up resistor and input gate
capacity. Hence, when reading data from the input port, set an appropriate waiting time. Care is particu-
larly required for key matrix configuration scanning. For reference, approximately 500 s waiting time is
required.
When "Pull up resistor disabled" is selected, the port can be used for slide switch input and interfacing
with other LSIs. In this case, take care that floating state does not occur.
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