EM78M611E

Universal Serial Bus Series Microcontroller

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 implemented to ensure proper operation of essential functions such as Status Register which records the calculation status, Port I/O Control Registers which control the I/O pins’ direction, etc. Lots of other special purpose registers are provided for various functions.

Note that Special Control Registers can only be read or written to by two instructions: IOR and IOW.

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Fig. 8-1 Data RAM Organization of EM7 M 11E

Product Specification (V1.11) 04.20.2007

9

(This specification is subject to change without further notice)

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Image 13
IBM EM78M611E manual Data Memory, Special Purpose Register