EM78M611E

Universal Serial Bus Series Microcontroller

8 Function Description

The EM78M611E memory is organized into three spaces, namely; User Program memory in 6K13 bits ROM space, Data Memory in 144 bytes SRAM space, EEPROM space and USB Application FIFOs for EndPoint0, EndPoint1, and EndPoint2. Furthermore, several registers are used for special purposes.

8.1 Program Memory

The program space of the EM78M611E is 6K words, and is divided into six pages. Each page is 1K words long. After a reset, the 13-bit Program Counter (PC) points to location zero of the program space.

The Interrupt Vector is at 0x0001 and accommodates TCC interrupt, RF1 (SE1) timing counter interrupt, RF2 (SE2) timing counter interrupt, P74~P77 State Changed interrupt, EndPoint0 interrupt, USB Suspend interrupt, USB Reset interrupt, and USB Host Resume interrupt.

After an interrupt, the MCU will fetch the next instruction from the corresponding address as illustrated in the following diagram.

After Reset

PC

 

0X0000

 

 

0X0001

 

 

 

 

0X03FF

 

 

 

 

0X0400

 

 

0X07FF

 

 

0X0800

 

 

0X0BFF

 

 

0X0C00

 

 

0X0FFF

 

 

0X1000

 

 

0X13FF

 

 

0X1400

 

 

0X17FF

Address

Reset Vector

Interrupt Vector

Page 0

Page 1

Page 2

Page 3

Page 4

Page 5

8

Product Specification (V1.1) 11.22.2006

(This specification is subject to change without further notice)

Page 12
Image 12
IBM EM78M611E manual Function Description, Program Memory