參數(shù)資料
型號: S1C621A0F0A0100
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 101/161頁
文件大?。?/td> 1037K
代理商: S1C621A0F0A0100
S1C621A0 TECHNICAL HARDWARE
EPSON
I-19
CHAPTER 3: PERIPHERAL CIRCUITS (Input Ports)
Input interrupt
An interrupt request to the CPU can be invoked by the
falling edge of an input port pin. For details, see section
3.11 "Interrupts and Halt".
Programming note
If the Knm pin is used as an input with an on-chip pull-up
resistor, the time constant of the input line capacitive load
and on-chip pull-up resistor causes the logic level to change
with a certain delay from the start of an input signal change.
For example, consider a key matrix combined with some N-
channel open drain outputs where turning a switch ON
causes the key scan program to start. Input data is read in
such a way that all the N-channel open drain outputs,
except one, are turned off to key-scan the input signal now
at low level as a result of switch-on, and the switch between
that output and the others is checked to determine has
turned ON. Even with switch-off, however, reading data
without a delay results in an input error (the input is at low
level). To prevent this, data must be programmed to assure
that it is read with a delay, or that all N-channel open drain
outputs are turned OFF, followed by reading the input
repeatedly to confirm that it returns to high level and turns
one output ON, then read input data.
Please consider delay of inputs on the program.
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