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2.6 Interrupts
The MB88121 FlexRay CC is supporting also interrupt events. These events are available at
pins and can be connected to MCU external interrupt pins.
2.6.1 CC interrupt
Depending on used bus interface mode a different number of interrupt pins are available at
CC side.
Table 2-9 CC interrupt output by 16bit non-multiplexed mode
2.7 DMA pins
The MB88121 is supporting DMA transfer from Host MCU. For this reason the DMA_Req pin
is available. This pin needs to be connected to a DMA request pin at MCU side. For
MB91F467D it is DREQ0 pin.
2.8 Stop Watch pin
The MB88121 supports the Stop Watch function. The function is similar to Input Capture
Unit, the time base is FlexRay global time. In case a external Signal, connected to Stop
Watch pin, is changing its Level the Macrotick value of FlexRay channel A and B is stored in
register and can be read out by host MCU.
This pin is an input pin. If the function is not used, a pull-up or pull-down resistor must be
connected to this pin.
© Fujitsu Microelectronics Europe GmbH
Interfacing MB91460 TO MB88121
Chapter 2 Hardware
CC pin
INT0
E-Ray interrupt line0 (eray_int0)
INT1
E-Ray interrupt line1 (eray_int1)
INT2
INT3
INT4
Low voltage detection interrupt
Table 2-8 CC interrupt output by 16bit multiplexed mode
CC pin
INT0
E-Ray interrupt line0 (eray_int0)
INT1
E-Ray interrupt line1 (eray_int1)
INT2
Low voltage detection interrupt
Interrupt type
E-Ray timer0 interrupt
E-Ray timer1 interrupt
Interrupt type
E-Ray timer0 interrupt
E-Ray timer1 interrupt
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MCU-AN-300016-E-V10
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