参数资料
型号: S1C63158B0A010R
元件分类: 微控制器/微处理器
英文描述: 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, PBGA
文件页数: 95/159页
文件大小: 1200K
代理商: S1C63158B0A010R
32
EPSON
S1C63808 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Input Ports)
4.4.5 Programming notes
(1) When input ports are changed from high to low by pull-down resistors, the fall of the waveform is
delayed on account of the time constant of the pull-down resistor and input gate capacitance. Hence,
when fetching input ports, set an appropriate waiting 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-down resistance 375 k
(Max.)
(2) After an interrupt occurs, the same interrupt will occur again if the interrupt enabled state (I flag =
"1") is set or the RETI instruction is executed unless the interrupt factor flag is reset. Therefore, be sure
to reset (write "1" to) the interrupt factor flag in the interrupt service routine before shifting to the
interrupt enabled state.
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