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LM8323 Datasheet(PDF) 11 Page - Texas Instruments |
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LM8323 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 47 page No Yes Is ERROR bit set? No Yes Is KEYPAD bit set? Read keypad events. READ_FIFO No Yes Is ROTATOR bit set? Read rotation steps. READ_ROTATOR No Yes Is a PWMxEND bit set? Service PWM channel. Check error code. READ_ERROR Initialize configuration. WRITE_CFG Configure clocks. WRITE_CLOCK Specify keypad size. SET_KEY_SIZE Configure GPIO pins. WRITE_PORT_STATE WRITE_PORT_SEL Check interrupt code. READ_INT Initialize keypad scan timing. SET_ACTIVE SET_DEBOUNCE No Is NOINIT bit set? Yes No Are NOINIT,ERROR, and COMMAND bits clear? Yes Check interrupt code. READ_INT No Yes Send any command. READ_PORT_STATE PWM_WRITE, etc. Host Initialization Is IRQ low? Service error condition. If the error code reports a FIFOOVR or KEYOVR error, then the FIFO buffer must be unloaded to clear the FIFO. If this is not done, the LM8323 will not store any new events in the FIFO. Any data unloaded from the FIFO after the error interrupt should be ignored. LM8323 www.ti.com SNLS273A – JULY 2010 – REVISED MARCH 2013 Figure 5. IRQ Reset Timing After sending the WRITE_CFG command, the host must send a series of commands to configure the LM8323, as shown in Figure 6. (See left hand side.) This Flow - diagram illustrates also the basic host communication steps which the host must execute upon an IRQ request received from the LM8323 during operation. Such requests will be made from the LM8323 as a result of key pressed events, the detection of an error, the termination of a PWM cycle and others. Figure 6. Host-Side LM8323 Initialization Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM8323 |
Número de pieza similar - LM8323_14 |
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Descripción similar - LM8323_14 |
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