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FDC37C78-HT Datasheet(PDF) 62 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 62 Page - Microchip Technology |
62 / 82 page ![]() 62 CONFIGURATION The configuration of the chip is programmable through software selectable configuration registers. CONFIGURATION REGISTER ADDRESS The Configuration Registers are located at address offset +0 and +1 with nCS active. CONFIGURATION REGISTERS The configuration registers are used to select programmable options of the chip. After power up, the chip is in the default mode. The default modes are identified in the Configuration Mode Register Description. To program the configuration registers, the following sequence must be followed: 1. Enter Configuration Mode. 2. Configure the Configuration Registers. 3. Exit Configuration Mode. Enter Configuration Mode To enter the configuration mode, two writes in succession to port +0 with 55H data are required. If a write to another address or port occurs between these two writes, the chip does not enter the configuration mode. It is strongly recommended that interrupts be disabled for the duration of these two writes. Configuration Mode The chip contains configuration registers CR00- CR1F. These registers are accessed by first writing the number (0-1FH) of the desired register to port +0 and then writing or reading the configuration register through port +1. Exit Configuration Mode The configuration mode is exited by writing an AAH to port +0. Programming Example The following is an example of a configuration program in Intel 8086 assembly language and assumes that the base address is set to 3F0H. |
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