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MAX7314 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX7314 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 25 page Device Reset The reset input RST is an active-low input. When taken low, RST clears any transaction to or from the MAX7314 on the serial interface and configures the internal regis- ters to the same state as a power-up reset (Table 3), which resets all ports as inputs. The MAX7314 then waits for a START condition on the serial interface. Detailed Description Initial Power-Up On power-up, and whenever the RST input is pulled low, all control registers are reset and the MAX7314 enters standby mode (Table 3). Power-up status makes all ports into inputs and disables both the PWM oscilla- tor and blink functionality. RST can be used as a hard- ware shutdown input, which effectively turns off any LED (or other) loads and puts the device into its lowest power condition. Configuration Register The configuration register is used to configure the PWM intensity mode, interrupt, and blink behavior, operate the INT/O16 output, and read back the interrupt status (Table 4). Ports Configuration The 16 I/O ports P0 through P15 can be configured to any combination of inputs and outputs using the ports configuration registers (Table 5). The INT/O16 output can also be configured as an extra general-purpose output, and the BLINK input can be configured as an extra general-purpose input using the configuration register (Table 4). Input Ports The input ports registers are read only (Table 6). They reflect the incoming logic levels of the ports, regardless of whether the port is defined as an input or an output by the ports configuration registers. Reading an input ports reg- ister latches the current-input logic level of the affected eight ports. A write to an input ports register is ignored. 18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection ______________________________________________________________________________________ 11 Table 2. Register Address Map REGISTER ADDRESS CODE (hex) AUTOINCREMENT ADDRESS Read input ports P7–P0 0x00 0x01 Read input ports P15–P8 0x01 0x00 Blink phase 0 outputs P7–P0 0x02 0x03 Blink phase 0 outputs P15–P8 0x03 0x02 Ports configuration P7–P0 0x06 0x07 Ports configuration P15–P8 0x07 0x06 Blink phase 1 outputs P7–P0 0x0A 0x0B Blink phase 1 outputs P15–P8 0x0B 0x0A Master, O16 intensity 0x0E 0x0E (no change) Configuration 0x0F 0x0F (no change) Outputs intensity P1, P0 0x10 0x11 Outputs intensity P3, P2 0x11 0x12 Outputs intensity P5, P4 0x12 0x13 Outputs intensity P7, P6 0x13 0x14 Outputs intensity P9, P8 0x14 0x15 Outputs intensity P11, P10 0x15 0x16 Outputs intensity P13, P12 0x16 0x17 Outputs intensity P15, P14 0x17 0x10 |
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