ZiLOG Zdots eZ80AcclaimPlus, User Manual

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UM024401-0412 Memory
eZ80AcclaimPlus! Development Kit
User Manual
15
Memory
The eZ80Acclaim Plus! 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 the
eZ80F91 ASSP Product Specification (PS0270) .
1. The Board features two power source options. It can be powered by connecting Port
P3 (USB Mini-B) to the USB port of the development PC using the USB A to USB
mini-B cable included in the Kit. The other option is to connect a female plug to an
external 5 VDC source with at least 300–400mA of current to Port P2. A drawing of
an optional external power supply plug is shown in Figure 8.
When the Board is powered via a USB connection, communication with the development
PC 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 a
device is connected to the Board that requires more than 500 mA @3.3 V. If either condi-
tion occurs, LED2 will illuminate.
Legend
A = 3.5 mm

B = 1.3 mm

C = 6 mm or longer
Figure 8. Female Plug