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M38B57MC Fiches technique(PDF) 16 Page - Mitsubishi Electric Semiconductor |
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M38B57MC Fiches technique(HTML) 16 Page - Mitsubishi Electric Semiconductor |
16 / 69 page MITSUBISHI MICROCOMPUTERS 38B5 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 16 PRELIMINAR Y Notice: This is not a final specification. Some parametric limits are subject to change. Interrupts Interrupts occur by twenty one sources: five external, fifteen internal, and one software. (1) Interrupt Control Each interrupt except the BRK instruction interrupt have both an interrupt request bit and an interrupt enable bit, and is controlled by the interrupt disable flag. An interrupt occurs if the corresponding interrupt request and enable bits are “1” and the interrupt disable flag is “0.” Interrupt enable bits can be set or cleared by software. Inter- rupt request bits can be cleared by software, but cannot be set by software. The BRK instruction interrupt and reset cannot be disabled with any flag or bit. The I flag disables all interrupts except the BRK instruction interrupt and reset. If several interrupts requests occurs at the same time the interrupt with highest priority is accepted first. (2) Interrupt Operation Upon acceptance of an interrupt the following operations are auto- matically performed: 1. The contents of the program counter and processor status register are automatically pushed onto the stack. 2. The interrupt disable flag is set and the corresponding interrupt request bit is cleared. 3. The interrupt jump destination address is read from the vector table into the program counter. sNotes on Use When the active edge of an external interrupt (INT0–INT4) is set or when switching interrupt sources in the same vector address, the corresponding interrupt request bit may also be set. Therefore, please take following sequence: (1) Disable the external interrupt which is selected. (2) Change the active edge in interrupt edge selection register (3) Clear the set interrupt request bit to “0.” (4) Enable the external interrupt which is selected. |
Numéro de pièce similaire - M38B57MC |
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Description similaire - M38B57MC |
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