EM78611

Universal Serial Bus Microcontroller Series

Preliminary

7

06/10/2003 (V1.0)

After reset

Address

0x0000

Reset Vector

0x0001

0x03FF

Interrupt Vector

Page 0

0x0400

0x07FF

Page 1

0x0800

0x0BFF

Page 2

0x0C00

0x0FFF

Page 3

0x1000

0x13FF

Page 4

0x1400

0x17FF

Page 5

PC

7.2

Data Memory

The Data Memory has 144 bytes SRAM space. It is also equipped with USB Application

FIFO space for USB Application. The Figure 7.1 (next page) shows the organization of the

Data Memory Space.

7.2.1 Special Purpose Register

When the microcontroller executes instruction, specific registers are invoked for assistance,

such as; Status Register which records the calculation status, Port I/O Control Registers

which control the I/O pins’ direction, etc. EM78611 provides a lot of other special purpose

registers for different functions.

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

IOW.