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M306V2EEFS 데이터시트(PDF) 65 Page - Renesas Technology Corp

부품명 M306V2EEFS
상세설명  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
PDF  271 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M306V2EEFS 데이터시트(HTML) 65 Page - Renesas Technology Corp

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Rev.1.40
Oct 06, 2004 page 65 of 269
M306V2ME-XXXFP, M306V2EEFP
2.7.19 Precautions for Interrupts
(1) Reading address 0000016
• When maskable interrupt is occurred, CPU read the interrupt information (the interrupt number and
interrupt request level) in the interrupt sequence.
The interrupt request bit of the certain interrupt written in address 0000016 will then be set to “0”.
Reading address 0000016 by software sets enabled highest priority interrupt source request bit to “0”.
Though the interrupt is generated, the interrupt routine may not be executed.
Do not read address 0000016 by software.
(2) Setting the stack pointer
• The value of the stack pointer immediately after reset is initialized to 000016. Accepting an interrupt
before setting a value in the stack pointer may become a factor of runaway. Be sure to set a value in
the stack pointer before accepting an interrupt.
(3) External interrupt
________
• Either an “L” level or an “H” level of at least 250 ns width is necessary for the signal input to pins INT0
_______
and INT1 regardless of the CPU operation clock.
_______
_______
•When the polarity of the INT0 and INT1 pins is changed, the interrupt request bit is sometimes set to
“1”. After changing the polarity, set the interrupt request bit to “0”. Figure 2.7.14 shows the procedure
______
for changing the INT interrupt generate factor.



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