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參數(shù)資料
| 型號(hào)： | S1C621C0D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC74 |
| 封裝： | DIE-74 |
| 文件頁(yè)數(shù)： | 31/108頁(yè) |
| 文件大?。?/td> | 992K |
| 代理商： | S1C621C0D |
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S1C621C0 TECHNICAL MANUAL
EPSON
21
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Input Ports)
4.4.5 Programming notes
(1) When input 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 capacitance. 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.
Waiting time = RIN
× (CIN + load capacitance on board) × 1.6 [sec]
RIN: pull up resistance (Max. value)
CIN: terminal capacitance (Max. value)
(2) When the input comparison register (KCP00–KCP03, KCP10–KCP13) is set, the interrupt factor flag
(IK0, IK1) may be set to "1" depending on the status of the input port terminal. Consequently, when
setting this register, do it in the DI status (interrupt flag = "0") and then read the interrupt factor flag in
order to reset, or after setting the interrupt selection register (SIK00–SIK03, SIK10–SIK13) to the inter-
rupt disabled status.
(3) Reading of interrupt factor flags is available at EI, but be careful in the following cases.
If the interrupt mask register value corresponding to the interrupt factor flags to be read is set to "1", an
interrupt request will be generated by the interrupt factor flags set timing, or an interrupt request will
not be generated.
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