M306V5EESP Mitsubishi, M306V5EESP Datasheet - Page 54

• Manufacturer Part Number: M306V5EESP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

54
2.7.19 Precautions for Interrupts
(1) Reading address 00000
(2) Setting the stack pointer
(3) External interrupt
• 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 00000
Reading address 00000
Though the interrupt is generated, the interrupt routine may not be executed.
Do not read address 00000
• The value of the stack pointer immediately after reset is initialized to 0000
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.
• Either an “L” level or an “H” level of at least 250 ns width is necessary for the signal input to pins INT
•When the polarity of the INT
and INT
“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.
_______
1
regardless of the CPU operation clock.
______
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
16
_______
by software sets enabled highest priority interrupt source request bit to “0”.
16
16
0
by software.
and INT
_______
1
pins is changed, the interrupt request bit is sometimes set to
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M306V5ME-XXXSP
16
16
will then be set to “0”.
. Accepting an interrupt
M306V5EESP
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Rev. 1.0
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