ZiLOG eZ80AcclaimPlus! User Manual

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ZiLOG eZ80AcclaimPlus! User Manual Manual pdf 25 page image

UM024401-0412 MemoryeZ80AcclaimPlus! Development KitUser Manual15MemoryThe eZ80AcclaimPlus! Development Board features the following memory configura-tions:• 8 KB on-chip SRAM• 256 KB on-chip Flash• 1 MB off-chip SRAM; U2 and U3 are accessible by chip selects CS1 and CS2• 8 MB off-chip Flash: U11 is accessible by chip select CS0To learn more about the operation of the eZ80F91 MCU’s internal memory, refer to theeZ80F91 ASSP Product Specification (PS0270).1. The Board features two power source options. It can be powered by connecting PortP3 (USB Mini-B) to the USB port of the development PC using the USB A to USBmini-B cable included in the Kit. The other option is to connect a female plug to anexternal 5 VDC source with at least 300–400mA of current to Port P2. A drawing ofan optional external power supply plug is shown in Figure 8.When the Board is powered via a USB connection, communication with the developmentPC can be established through the FT232RL chip (U8) to provide a USB-to-serial inter-face. The UART0 block of the eZ80F91 MCU is connected to this chip.An on-board USB port (U6) provides overcurrent protection in the event of a short or if adevice is connected to the Board that requires more than 500 mA @3.3 V. If either condi-tion occurs, LED2 will illuminate.LegendA = 3.5 mmB = 1.3 mmC = 6 mm or longerFigure 8. Female Plug