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參數(shù)資料
| 型號： | S1C63406F |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP128 |
| 封裝： | PLASTIC, TQFP15-128 |
| 文件頁數(shù)： | 86/144頁 |
| 文件大小： | 1160K |
| 代理商： | S1C63406F |
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38
EPSON
S1C63406 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Ports)
4.6.2 Mask option
In the I/O ports, the output specification during output mode can be selected from either complementary
output or N-channel open drain output in 1-bit units.
When N-channel open drain output is selected, do not apply a voltage exceeding the power supply
voltage to the port.
The output specification selected by mask option are effective even when I/O ports are used as the serial
interface output port.
4.6.3 I/O control registers and input/output mode
Input or output mode can be set for the I/O ports by writing data into the corresponding I/O control
registers IOC2x.
To set the input mode, write "0" to the I/O control register. When an I/O port is set to input mode, it
becomes high impedance status and works as an input port.
However, when the pull-up explained in the following section has been set by software, the input line is
pulled up only during this input mode.
To set the output mode, write "1" is to the I/O control register. When an I/O port is set to output mode , it
works as an output port, it outputs a high level (VDD) when the port output data is "1", and a low level
(VSS) when the port output data is "0".
If perform the read out in each mode; when output mode, the register value is read out, and when input
mode, the port value is read out.
At initial reset, the I/O control registers are set to "0", and the I/O ports enter the input mode.
The I/O control registers of the ports that are set as input/output for the serial interface can be used as
general purpose registers that do not affect the I/O control. (See Table 4.6.1.1.)
4.6.4 Pull-up during input mode
A pul-up resistor that operates during the input mode is built into each I/O port of the S1C63406.
The pull-up resistor becomes effective by writing "1" to the pull-up control register PPL2x that corre-
sponds to each port, and the input line is pulled up during the input mode. When "0" has been written,
no pull-up is done.
At initial reset, the pull-up control registers are set to "1".
The pull-up control registers of the ports, that are set as output for the serial interface, can be used as
general purpose registers that do not affect the pull-up control. (See Table 4.6.1.1.)
The pull-up control registers of the port, that are set as input for the serial interface, function the same as
the I/O port.
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