Bosch Appliances TTCAN user manual Message Handler Registers, Interrupt Register addresses 0x09

TTCAN User’s Manual Revision 1.6

manual_about.fm

Data 0 1st data byte of a CAN Data Frame

Data 1 2nd data byte of a CAN Data Frame

Data 2 3rd data byte of a CAN Data Frame

Data 3 4th data byte of a CAN Data Frame

Data 4 5th data byte of a CAN Data Frame

Data 5 6th data byte of a CAN Data Frame

Data 6 7th data byte of a CAN Data Frame

Data 7 8th data byte of a CAN Data Frame

Note : Byte Data 0 is the first data byte shifted into the shift register of the CAN Core during a recep- tion, byte Data 7 is the last. When the Message Handler stores a Data Frame, it will write all the eight data bytes into a Message Object. If the Data Length Code is less than 8, the remaining bytes of the Message Object will be overwritten by non specified values .

3.4 Message Handler Registers

All Message Handler registers are read-only. Their contents (TxRqst, NewDat, IntPnd, and MsgVal bits of each Message Object and the Interrupt Identifier) is status information provided by the Message Handler FSM.

3.4.1 Interrupt Register (addresses 0x09 & 0x08)

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
			IntId15-8								IntId7-0
				r								r
IntId15-0Interrupt Identifier (the number here indicates the source of the interrupt)
		0x0000			No interrupt is pending.
		0x0001-0x0020			Number of Message Object which caused the interrupt.
		0x0021-0x3FFF			unused.
		0x4000			TTCAN Interrupt.
		0x4001-0x7FFF			unused.
		0x8000			Status Interrupt.
		0x8001-0xBFFF			unused.
		0xC000			TTCAN Interrupt and Status Interrupt.

0xC001-0xFFFF unused.

If several interrupts are pending, the CAN Interrupt Register will point to the pending interrupt with the highest priority, disregarding their chronological order. An interrupt remains pending until the CPU has cleared it. If IntId is different from 0x0000 and IE is set, the interrupt line to the CPU, IRQ_B, is active. The interrupt line remains active until IntId is back to value 0x0000 (the cause of the interrupt is reset) or until IE is reset.

The Status Interrupt has the highest priority. Among the message interrupts, the Message Object’s interrupt priority decreases with increasing message number.

A message interrupt is cleared by clearing the Message Object’s IntPnd bit. The Status Interrupt is cleared by reading the Status Register. The TTCAN Interrupt is cleared by reading the TTCAN Interrupt Vector Register.

BOSCH - 27/77 - 11.11.02