37
MC95FG308 / MC95FG208
ABOV Semiconductor Co., Ltd.
8
Memory
The MC95FG308 addresses two separate address memory stores: Program memory and Data memory. The logical
separation of Program and Data memory allows Data memory to be assessed by 8-bit addresses, which can be more
quickly stored and manipulated by 8-bit CPU. Nevertheless, 16-bit Data memory addresses can also be generated
through the DPTR register.
Program memory can only be read, not written to. There can be up to 64Kbytes of Program memory. In the
MC95FG308 FLASH version of these devices the 8Kbytes of Program memory are provided on-chip. Data memory
can be read and written to up to 256bytes internal memory (DATA) including the stack area.
8.1
Program Memory
A 16-bit program counter is capable of addressing up to 64Kbytes, but this device has just 8Kbytes program memory
space.
Figure 8.1 shows a map of the lower part of the program memory. After reset, the CPU begins execution from location
0000H. Each interrupt is assigned a fixed location in program memory. The interrupt causes the CPU to jump to that
location, where it commences execution of the service routine. External interrupt 0, for example, is assigned to location
0003H. If external interrupt 0 is going to be used, its service routine must begin at location 0003H. If the interrupt is not
going to be used, its service location is available as general purpose program memory. If an interrupt service routine is
short enough (as is often the case in control applications), it can reside entirely within that 8-byte interval. Longer
service routines can use a jump instruction to skip over subsequent interrupt locations, if other interrupts are in use.
Содержание MC95FG208 Series
Страница 14: ...14 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 32 Pin SOP Package...
Страница 15: ...15 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 2 32 Pin QFN Package...
Страница 16: ...16 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 3 32 Pin LQFP Package...
Страница 17: ...17 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 4 28 Pin SOP Package...
Страница 18: ...18 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 5 28 Pin SOP Package continue...
Страница 19: ...19 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 6 28 Pin SOP Package...
Страница 20: ...20 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 7 28 Pin TSSOP Package...
Страница 21: ...21 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 8 20 Pin SOP Package...
Страница 22: ...22 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 9 20 Pin TSSOP Package...
Страница 23: ...23 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 10 16 Pin SOP Package...
Страница 24: ...24 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 11 16 Pin TSSOP Package...