ZHCS290G September 2009 – June 2018 TCA8418
PRODUCTION DATA.
The TCA8418 allows for overflow detection of the 10 byte FIFO of key-press and release events. For overflow to be enabled, both Bit_3 and Bit_5 of the Configuration Register (see Table 11) must be set High. If only Bit_3 set high, no overflow interrupt is generated.
| BIT | NAME | DESCRIPTION |
|---|---|---|
| 7 | AI | Auto-increment for read and write operation |
| 0 = disabled | ||
| 1 = enabled | ||
| 6 | CPI_E_CFG | GPI even mode configuration |
| 0 = GPI events are tracked when keypad is locked | ||
| 1 = GPI events are not tracked when keypad is locked | ||
| 5 | OVR_FLOW_M | Overflow mode |
| 0 = disabled; overflow data is lost | ||
| 1 = enabled. | ||
| 4 | INT_CFG | Overflow data shifts with last event pushing first event out interrupt configuration. |
| 0 = processor interrupt remains asserted (or low) if host tries to clear interrupt while there is still a pending key press, key release or GPI interrupt | ||
| 1 = processor interrupt is deasserted for 50 µs and reassert with pending interrupts | ||
| 3 | OVR_FLOW_IEN | Overflow interrupt enable |
| 0 = disabled | ||
| 1 = enabled | ||
| 2 | K_LCK_IEN | Keypad lock interrupt enable |
| 0 = disabled | ||
| 1 = enabled |