48
MC96F6432A
ABOV Semiconductor Co., Ltd.
8
Memory
The MC96F6432A addresses two separate address memory stores: Program memory and Data memory. The logical
separation of Program and Data memory allows Data memory to be accessed by 8-bit addresses, which makes the 8-
bit CPU access the data memory more rapidly. Nevertheless, 16-bit Data memory addresses can also be generated
through the DPTR register.
MC96F6432A provides on-chip 32 Kbytes of the ISP type flash program memory, which can be read and written to.
Internal data memory (IRAM) is 256 bytes and it includes the stack area. External data memory (XRAM) is 768 bytes
and it includes 27 bytes of LCD display RAM.
8.1
Program Memory
A 16-bit program counter is capable of addressing up to 64 Kbytes, but this device has just 32 Kbytes as program
memory space.
Figure 8.1 shows the map of the lower part of the program memory. After reset, the CPU begins execution from
address 0000H. Each interrupt is assigned to a fixed address in program memory. The interrupt causes the CPU to
jump to that address, where it commences execution of the service routine. External interrupt 11, for example, is
assigned to address 000BH. If external interrupt 11 would be requested, its service routine must begin at location
000BH. When the interrupt is not used, the Rom address is used as general purpose program memory. If an interrupt
service routine is short enough (as is often case in S/W), it can reside entirely within that 8 bytes interval. Longer
service routines can use a jump instruction to skip over subsequent interrupt locations, if other interrupts are in use.
Содержание MC96F6432A
Страница 16: ...16 MC96F6432A ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 48 Pin QFN Package ...
Страница 17: ...17 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 2 44 Pin MQFP Package ...
Страница 18: ...18 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 3 32 Pin LQFP Package ...
Страница 19: ...19 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 4 32 Pin SOP Package ...
Страница 20: ...20 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 5 28 Pin SOP Package ...