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MC68HC08AS32A/D Datasheet(PDF) 94 Page - NXP Semiconductors |
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MC68HC08AS32A/D Datasheet(HTML) 94 Page - NXP Semiconductors |
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94 / 296 page  Data Sheet MC68HC08AS32A — Rev. 1.1 94 Freescale Semiconductor Upon receiving a BDLC interrupt, the user can read the value within the BSVR, transferring it to the CPU’s index register. The value can then be used to index into a jump table, with entries four bytes apart, to quickly enter the appropriate service routine. For example: NOTE: The NOPs are used only to align the JMPs onto 4-byte boundaries so that the value in the BSVR can be used intact. Each of the service routines must end with an RTI instruction to guarantee correct continued operation of the device. Note also that the first entry can be omitted since it corresponds to no interrupt occurring. The service routines should clear all of the sources that are causing the pending interrupts. Note that the clearing of a high priority interrupt may still leave a lower priority interrupt pending, in which case bits I0, I1, and I2 of the BSVR will then reflect the source of the remaining interrupt request. If fewer states are used or if a different software approach is taken, the jump table can be made smaller or omitted altogether. Table 4-5. BDLC Interrupt Sources BSVR I3 I2 I1 I0 Interrupt Source Priority $00 0 0 0 0 No interrupts pending 0 (lowest) $04 0 0 0 1 Received EOF 1 $08 0 0 1 0 Received IFR byte (RXIFR) 2 $0C 0 0 1 1 BDLC Rx data register full (RDRF) 3 $10 0 1 0 0 BDLC Tx data register empty (TDRE) 4 $14 0 1 0 1 Loss of arbitration 5 $18 0 1 1 0 Cyclical redundancy check (CRC) error 6 $1C 0 1 1 1 Symbol invalid or out of range 7 $20 1 0 0 0 Wakeup 8 (highest) Service LDX BSVR Fetch State Vector Number JMP JMPTAB,X Enter service routine, * (must end in RTI) * JMPTAB JMP SERVE0 Service condition #0 NOP JMP SERVE1 Service condition #1 NOP JMP SERVE2 Service condition #2 NOP * JMP SERVE8 Service condition #8 END |
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