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)： 88/144頁
文件大?。?/td> 1160K
代理商： S1C63406F
40
EPSON
S1C63406 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Ports)
P20–P23: P2 I/O port data register (FF4AH)
I/O port data can be read and output data can be set through these registers.
When writing data
When "1" is written: High level
When "0" is written: Low level
When an I/O port is set to the output mode, the written data is output unchanged from the I/O port
terminal. When "1" is written as the port data, the port terminal goes high (VDD), and when "0" is written,
the terminal goes low (VSS).
Port data can be written also in the input mode.
When reading data
When "1" is read: High level
When "0" is read: Low level
The terminal voltage level of the I/O port is read out. When the I/O port is in the input mode the voltage
level being input to the port terminal can be read out; in the output mode the register value can be read.
When the terminal voltage is high (VDD) the port data that can be read is "1", and when the terminal
voltage is low (VSS) the data is "0".
When the PPL register is set to "1", the built-in pull-up resister goes ON during input mode, so that the
I/O port terminal is pulled up.
The data registers of the port, which are set for the input/output of the serial interface, become general-
purpose registers that do not affect the input/output.
Note: When in the input mode, I/O ports are changed from low to high by pull-up resistor, the rise of the
waveform is delayed on account of the time constant of the pull-up resistor and input gate capaci-
tance. Hence, when fetching input ports, set an appropriate wait time.
Particular care needs to be taken of the key scan during key matrix configuration.
Make this waiting time the amount of time or more calculated by the following expression.
10
× C × R
C: terminal capacitance 5 pF + parasitic capacitance ? pF
R: pull-up resistance 300 k
IOC20–IOC23: P2 port I/O control register (FF48H)
The input and output modes of the I/O ports are set with these registers.
When "1" is written: Output mode
When "0" is written: Input mode
Reading: Valid
The input and output modes of the I/O ports are set in 1-bit unit.
Writing "1" to the I/O control register makes the corresponding I/O port enter the output mode, and
writing "0" induces the input mode.
At initial reset, these registers are all set to "0", so the I/O ports are in the input mode.
The I/O control registers of the port, which are set for the input/output of the serial interface, become
general-purpose registers that do not affect the input/output.
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