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ML2240TB Scheda tecnica(PDF) 11 Page - OKI electronic componets |
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ML2240TB Scheda tecnica(HTML) 11 Page - OKI electronic componets |
11 / 24 page FEDL2240DIGEST-02 OKI Semiconductor ML2240 Family 11/24 FUNCTIONAL DESCRIPTION Micro-computer Interface The micro-computer interface in the ML2240 has 2 types of interface circuits built in: Parallel interface and serial interface. The interface setting can be changed with the SERIAL pin. SERIAL pin = "H" level: Serial interface SERIAL pin = "L" level: Parallel interface Table below shows the SERIAL pin status in the serial and parallel interfaces. SERIAL = “L” SERIAL = “H” Parallel interface Serial interface D7 (I/O) DI (I) Serial data input pin D6 (I/O) SCK (I) Serial clock input pin D5 (I/O) DO (O) Channel status serial output pin D4 (I/O) STASEL (I) Channel status switching pin NCRn output at “L” level BUSYn output at “H” level D3 (I/O) STA3 (O) Channel 4 status output pin D2 (I/O) STA2 (O) Channel 3 status output pin D1 (I/O) STA1 (O) Channel 2 status output pin D0 (I/O) Data input and output pins/ status output pin STA0 (O) Channel 1 status output pin 1. Parallel Interface When selecting the parallel interface, the I/O pins CS, WR, D7 to D0, and RD are used as input pins to input various commands and data, and as output pins to read out the status of the commands and data input. The micro-computer interface becomes effective when the CS pin is set to “L” level. When a command or data is input, the input data to D7 through D0 pins is captured inside the device on the rising edge of the WR pin. To read the channels status, pins CS and RD are made “L” level. By doing so, the status signals of each channel are output to D7 through D0 pins. Command and Data Input Timing CS (I) WR (I) D7 to D0 (I/O) Data Stable |
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