EM78M611E
Universal Serial Bus Series Microcontroller
Product Specification (V1.11) 04.20.2007
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(This specification is subject to change without further notice)
8.2 Data Memory
The Data Memory has 144 bytes SRAM space. It has also an on-chip USB Application
FIFO space for USB Application. Figure 8-1 (next page) shows the organization of the
Data Memory Space.

8.2.1 Special Purpose Register

When the microcontroller executes instructions, specific registers are im plemented to
ensure proper operation of es sential functions such as Status Register which records
the calculation status, Port I/O Control Registers which c ontrol the I/O pins’ direction,
etc. Lots of other special purpose registers are provided for various functions.
Note that Special Control Registers c an only be read or written to b y two instructions:
IOR and IOW.
16x 8 C o mm o n
Reg is te r

Fig. 8-1 Data RAM Organization of EM78M611E