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EP7309 Datasheet(PDF) 5 Page - Cirrus Logic |
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EP7309 Datasheet(HTML) 5 Page - Cirrus Logic |
5 / 46 page DS507PP1 Copyright 2001 Cirrus Logic (All Rights Reserved) 5 EP7309 High-Performance, Low-Power System on Chip Synchronous Serial Interface • ADC (SSI) Interface: Master mode only; SPI and Microwire1-compatible (128 kbps operation) • Selectable serial clock polarity LCD Controller A DMA address generator is provided that fetches video display data for the LCD controller from memory. The display frame buffer start address is programmable, allowing the LCD frame buffer to be in SDRAM, internal SRAM or external SRAM. • Interfaces directly to a single-scan panel monochrome STN LCD • Interfaces to a single-scan panel color STN LCD with minimal external glue logic • Panel width size is programmable from 32 to 1024 pixels in 16-pixel increments • Video frame buffer size programmable up to 128 KB • Bits per pixel of 1, 2, or 4 bits 64-Keypad Interface Matrix keyboards and keypads can be easily read by the EP7309. A dedicated 8-bit column driver output generates strobes for each keyboard column signal. The pins of Port A, when configured as inputs, can be selectively OR'ed together to provide a keyboard interrupt that is capable of waking the system from a STANDBY or IDLE state. • Column outputs can be individually set high with the remaining bits left at high-impedance • Column outputs can be driven all-low, all-high, or all- high-impedance • Keyboard interrupt driven by OR'ing together all Port A bits • Keyboard interrupt can be used to wake up the system • 8 ×8 keyboard matrix usable with no external logic, extra keys can be added with minimal glue logic Interrupt Controller When unexpected events arise during the execution of a program (i.e., interrupt or memory fault) an exception is usually generated. When these exceptions occur at the same time, a fixed priority system determines the order in which they are handled. The EP7309 interrupt controller has two interrupt types: interrupt request (IRQ) and fast interrupt request (FIQ). The interrupt controller has the ability to control interrupts from 22 different FIQ and IRQ sources. • Supports 22 interrupts from a variety of sources (such as UARTs, SSI1, and key matrix.) • Routes interrupt sources to the ARM720T’s IRQ or FIQ (Fast IRQ) inputs • Five dedicated off-chip interrupt lines operate as level sensitive interrupts . Note: Pins are multiplexed. See Table R on page 7 for more information. Real-Time Clock The EP7309 contains a 32-bit Real Time Clock (RTC) that can be written to and read from in the same manner as the timer counters. It also contains a 32-bit output match register which can be programmed to generate an interrupt. Pin Mnemonic I/O Pin Description ADCLK O SSI1 ADC serial clock ADCIN I SSI1 ADC serial input ADCOUT O SSI1 ADC serial output nADCCS O SSI1 ADC chip select SMPCLK O SSI1 ADC sample clock Table G. Serial Interface Pin Assignments Pin Mnemonic I/O Pin Description CL1 O LCD line clock CL2 O LCD pixel clock out DD[3:0] O LCD serial display data bus FRM O LCD frame synchronization pulse M O LCD AC bias drive Table H. LCD Interface Pin Assignments Pin Mnemonic I/O Pin Description COL[7:0] O Keyboard scanner column drive Table I. Keypad Interface Pin Assignments Pin Mnemonic I/O Pin Description nEINT[2:1] I External interrupt EINT[3] I External interrupt nEXTFIQ I External Fast Interrupt input nMEDCHG/nBROM (Note) I Media change interrupt input Table J. Interrupt Controller Pin Assignments |
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