GL640USB Ver la hoja de datos (PDF) - Genesys Logic

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GL640USB

IEEE-1284 to USB Bridge

Genesys Logic 

GL640USB, GL640USB-A

7. 8-BIT RISC MCU INSTRUCTION

7.1 MEMORY ORGANIZATION

The memory in the microcontroller is organized into user program memory in program ROM and

data memory in SRAM space.

Program Memory Organization

The 11-bit Program Counter (PC) is capable of addressing 2.25K x 14 of program space.

However, the program space of the GL640USB is 2K x 14. The program memory space is

divided into two functional groups: Interrupt Vectors and program code. After a reset, the

Program Counter points to location zero of the program space. After a timer interrupt, the

Program Counter points the location 0x0004 of the program space.

After Reset

→ Addres

s

0x0000 Reset Vector

After Timer

Interrupt

→ 0x0004 Timer Interrupt Vector

0x0005

2K x 14 ROM

0x07FF

Figure 7-1 Program Memory Space

Revision 1.1

-9-

Jun. 7, 1999

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