Interrupt Queue Mask (Imask) - Freescale Semiconductor MPC850 User Manual

Interrupt Queue Mask (IMASK)

41.3 Interrupt Queue Mask (IMASK)
IMASK is the interrupt mask for both the receive and transmit sides of a channel and is
located in the RCT; see Section 37.2.1, "Receive Connection Table (RCT). Shown in
Figure 41-5, it allows the user to enable or disable interrupt generation. If a bit in IMASK
is cleared, the corresponding event does not cause an entry to be added to the interrupt
queue, and the GINT global interrupt counter is not incremented.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
— CNG — UN RXF BSY TXB RXB
Figure 41-5. Interrupt Queue Mask (IMASK)
Note that because the masking is performed in microcode, approximately 40 system clocks
must elapse for a change in IMASK to take effect.
MPC850 Family User's Manual