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參數(shù)資料
| 型號： | S1C60N09D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.08 MHz, MICROCONTROLLER, UUC70 |
| 封裝： | DIE-70 |
| 文件頁數(shù)： | 20/62頁 |
| 文件大?。?/td> | 476K |
| 代理商： | S1C60N09D |
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CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Ports)
S1C60N09 TECHNICAL MANUAL
EPSON
21
IOC0, IOC1: I/O control registers (07EHD0, 0FEHD0)
The input or output mode of the I/O port can be set with these registers.
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, IOC0 sets the mode for
P00–P03 and IOC1 sets the mode for P10–P13.
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.
After an initial reset, these registers are set to "0", so the I/O ports are in the input mode.
4.5.5 Programming notes
(1) When the I/O port is set to the output mode and a low-impedance load is connected to the port
terminal, the data written to the register may differ from the data read.
(2) When the I/O port is set to the input mode and a low-level voltage (Vss) is input, an erroneous input
results if the time constant of the capacitive load of the input line and the built-in pull-down resistor
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 potential of the
terminals must settle within 0.5 cycles. If this condition cannot be met, some measure must be de-
vised, such as arranging a pull-down resistor externally, or performing multiple read-outs.
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