Data Memory; Special Purpose Register - IBM EM78M611E Specification

Ibm universal serial bus product specification

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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.

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.

Product Specification (V1.11) 04.20.2007

(This specification is subject to change without further notice)

1 6 x 8 C o m m o n

R e g is te r

Fig. 8-1 Data RAM Organization of EM78M611E

Universal Serial Bus Series Microcontroller

EM78M611E

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