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C8051F50X Datasheet(PDF) 98 Page - Silicon Laboratories |
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C8051F50X Datasheet(HTML) 98 Page - Silicon Laboratories |
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98 / 312 page  C8051F50x-F51x 98 Rev. 1.1 12.1. Program Memory The CIP-51 core has a 64 kB program memory space. The C8051F50x-F51x devices implement 64 kB or 32 kB of this program memory space as in-system, re-programmable Flash memory, organized in a contig- uous block from addresses 0x0000 to 0xFFFF in 64 kB devices and addresses 0x0000 to 0x7FFF in 32 kB devices. The address 0xFBFF in 64 kB devices and 0x7FFF in 32 kB devices serves as the security lock byte for the device. Addresses above 0xFDFF are reserved in the 64 kB devices. Figure 12.2. Flash Program Memory Map 12.1.1. MOVX Instruction and Program Memory The MOVX instruction in an 8051 device is typically used to access external data memory. On the C8051F50x-F51x devices, the MOVX instruction is normally used to read and write on-chip XRAM, but can be re-configured to write and erase on-chip Flash memory space. MOVC instructions are always used to read Flash memory, while MOVX write instructions are used to erase and write Flash. This Flash access feature provides a mechanism for the C8051F50x-F51x to update program code and use the program memory space for non-volatile data storage. Refer to Section “15. Flash Memory” on page 129 for further details. 12.2. Data Memory The C8051F50x-F51x devices include 4352 bytes of RAM data memory. 256 bytes of this memory is mapped into the internal RAM space of the 8051. The other 4096 bytes of this memory is on-chip “exter- nal” memory. The data memory map is shown in Figure 12.1 for reference. 12.2.1. Internal RAM There are 256 bytes of internal RAM mapped into the data memory space from 0x00 through 0xFF. The lower 128 bytes of data memory are used for general purpose registers and scratch pad memory. Either direct or indirect addressing may be used to access the lower 128 bytes of data memory. Locations 0x00 through 0x1F are addressable as four banks of general purpose registers, each bank consisting of eight Lock Byte 0x0000 0x7FFF 0x7FFE 0x7E00 Flash Memory Space (32kB Flash Device) Lock Byte Page Lock Byte 0x0000 0xFBFF 0xFBFE 0xFC00 0xFA00 Flash Memory Space (64kB Flash Device) Lock Byte Page 0xFFFF Reserved Area C8051F500/1/2/3/8/9 C8051F504/5/6/7-F510/1 |
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