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3.2 Interrupts
Using interrupts of the MB88121 Communication Controller requires connection to
external interrupt pin. That requires also the setup of the external interrupt at MCU
beside the setup of the interrupt at MB88121 side.
3.2.1 MB88121 interrupt
Depending on used bus interface mode the MB88121 have different interrupt pins available.
Table 3-11 CC interrupt output by 16bit multiplexed mode
Table 3-12 CC interrupt output by 16bit non-multiplexed mode
After power-on / Reset these pins are set to output driving Low level. Interrupt requests are
indicated by High Level output at the pins.
To enable the output of the signals INT2 to INT 4 the INT (Interrupt register) at offset
address 0x0C (0x50.000C) must be used.
indication a request just a few Macroticks, It is recommended to use rising edge detection for
the external interrupts.
The INT0 and INT1 pins are connected to the Eray_int0 and Eray_int1 interrupts. The
functions are configured with the E-Ray interrupt registers. In case of an interrupt request the
pins output High-level and remaining the level until the Interrupt Flag is clear in the
corresponding register.
Following interrupt registers are available:
•
Error Interrupt Register (EIR): indicates an error interrupt request
•
Status Interrupt Register (SIR): indicates a status interrupt request
•
Error Interrupt Line Select (EILS): Selects which error interrupt is output at which
eray_int (0 or 1) line.
•
Status Interrupt Line Select (SILS): Selects which status interrupt is output at which
eray_int (0 or 1) line.
MCU-AN-300016-E-V10
Interfacing MB91460 TO MB88121
Chapter 3 Software
CC pin
INT0
E-Ray interrupt line0 (eray_int0)
INT1
E-Ray interrupt line1 (eray_int1)
INT2
INT3
INT4
Low voltage detection interrupt
CC pin
INT0
E-Ray interrupt line0 (eray_int0)
INT1
E-Ray interrupt line1 (eray_int1)
INT2
Low voltage detection interrupt
- 36 -
Interrupt type
E-Ray timer0 interrupt
E-Ray timer1 interrupt
Interrupt type
E-Ray timer0 interrupt
E-Ray timer1 interrupt
The dedicated E-Ray timer interrupts are
© Fujitsu Microelectronics Europe GmbH
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