參數資料
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: 141/161頁
文件大?。?/td> 1037K
代理商: S1C621A0F0A0100
I-56
EPSON
S1C621A0 TECHNICAL HARDWARE
CHAPTER 3: PERIPHERAL CIRCUITS (Interrupt and Halt)
<Input interrupt programing related precautions>
Fig. 3.11.3
Input Interrupt Timing
When using an input interrupt, if you rewrite the content
of the mask register, when the value of the input terminal
which becomes the interrupt input is in the active status
(input terminal = low status), the factor flag for input
interrupt may be set.
For example, a factor flag is set with the timing of
shown in Figure 3.11.3. However, when clearing the
content of the mask register with the input terminal kept
in the low status and then setting it, the factor flag of the
input interrupt is again set at the timing that has been
set.
Consequently, when the input terminal is in the active
status (low status), do not rewrite the mask register
(clearing, then setting the mask register), so that a factor
flag will only set at the falling edge in this case. When
clearing, then setting the mask register, set the mask
register, when the input terminal is not in the active
status (high status).
When the content of the mask register is rewritten, while
the port K input is in the active status. The input interrupt
factor flag is set at .
Port K input
Factor flag set Not set
Mask register
Active status
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