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C8051F040-GQR Datasheet(PDF) 27 Page - Silicon Laboratories |
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C8051F040-GQR Datasheet(HTML) 27 Page - Silicon Laboratories |
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27 / 328 page  C8051F040/1/2/3/4/5/6/7 Rev. 1.5 27 1.2. On-Chip Memory The CIP-51 has a standard 8051 program and data address configuration. It includes 256 bytes of data RAM, with the upper 128 bytes dual-mapped. Indirect addressing accesses the upper 128 bytes of general purpose RAM, and direct addressing accesses the 128 byte SFR address space. The CIP-51 SFR address space contains up to 256 SFR Pages. In this way, the CIP-51 MCU can accommodate the many SFRs required to control and configure the various peripherals featured on the device. The lower 128 bytes of RAM are accessible via direct and indirect addressing. The first 32 bytes are addressable as four banks of general purpose registers, and the next 16 bytes can be byte addressable or bit addressable. The CIP-51 in the C8051F04x MCUs additionally has an on-chip 4 kB RAM block and an external memory interface (EMIF) for accessing off-chip data memory or memory-mapped peripherals. The on-chip 4 byte block can be addressed over the entire 64 kB external data memory address range (overlapping 4 kB boundaries). External data memory address space can be mapped to on-chip memory only, off-chip mem- ory only, or a combination of the two (addresses up to 4 kB directed to on-chip, above 4 kB directed to EMIF). The EMIF is also configurable for multiplexed or non-multiplexed address/data lines. The MCU's program memory consists of 64 kB (C8051F040/1/2/3/4/5) or 32 kB (C8051F046/7) of Flash. This memory may be reprogrammed in-system in 512 byte sectors, and requires no special off-chip pro- gramming voltage. The 512 bytes from addresses 0xFE00 to 0xFFFF are reserved for the 64 kB devices. There is also a single 128 byte sector at address 0x10000 to 0x1007F, which may be useful as a small table for software constants. See Figure 1.7 for the MCU system memory map. Figure 1.7. On-Chip Memory Map PROGRAM/DATA MEMORY (FLASH) (Direct and Indirect Addressing) 0x00 0x7F Upper 128 RAM (Indirect Addressing Only) 0x80 0xFF Special Function Registers (Direct Addressing Only) DATA MEMORY (RAM) General Purpose Registers 0x1F 0x20 0x2F Bit Addressable Lower 128 RAM (Direct and Indirect Addressing) 0x30 INTERNAL DATA ADDRESS SPACE EXTERNAL DATA ADDRESS SPACE XRAM - 4096 Bytes (accessable using MOVX instruction) 0x0000 0x0FFF Off-chip XRAM space 0x1000 0xFFFF 64 kB Flash (In-System Programmable in 512 Byte Sectors) 0x0000 RESERVED 0xFE00 0xFDFF Scrachpad Memory (DATA only) 0x1007F 0x10000 Up To 256 SFR Pages 1 3 0 2 F C8051F040/1/2/3/4/5 32 kB Flash (In-System Programmable in 512 Byte Sectors) 0x0000 RESERVED 0x8000 0x7FFF Scrachpad Memory (DATA only) 0x1007F 0x10000 C8051F046/7 |
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