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TSC80251G1D-L12CED 数据表(PDF) 8 Page - TEMIC Semiconductors |
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TSC80251G1D-L12CED 数据表(HTML) 8 Page - TEMIC Semiconductors |
8 / 52 page TSC87251G1A 8 Rev. A – September 21, 1998 6. Address Spaces The TSC87251G1A implements four different address spaces: D On–chip EPROM/OTPROM program/code memory D On–chip RAM data memory D Special Function Registers (SFRs) D Configuration array 6.1. Program/Code Memory The TSC87251G1A implements 16 Kbytes of on–chip EPROM/OTPROM for program/code memory. Figure 4 shows the split of the internal and external program/code memory spaces. If EA# is tied to a high level, the 16–Kbyte on–chip program/code memory is mapped in the lower part of segment FF: where the C251 core jumps after reset. The rest of the program/code memory space is mapped to the external memory. If EA# is tied to a low level, the internal program/code memory is not used and all the accesses are directed to the external memory. FF:3FFFh FF:0000h FD:FFFFh 02:0000h Reserved On–chip Memory EPROM/OTPROM Code Program/code Segments Program/code External Memory Space FF:FFFFh FF:4000h FE:0000h 01:FFFFh 01:0000h 00:0000h 00:FFFFh FE:FFFFh EA#= 1 16 Kbytes 48 Kbytes 16 Kbytes 64 Kbytes 128 Kbytes EA#= 0 Figure 4. Program/Code Memory Mapping Notes: Special care should be taken when the Program Counter (PC) increments: – If the program executes exclusively from on–chip code memory (not from external memory), beware of executing code from the upper eight bytes of the on–chip EPROM (FF:3FF8h–FF:3FFFFh). Because of its pipeline capability, the TSC87251G1A may attempt to prefetch code from external memory (at an address above FF:3FFFFh) and thereby disrupt I/O Ports 0 and 2. Fetching code constants from these 8 bytes does not affect Ports 0 and 2. – When PC reaches the end of segment FF:, it loops to the reset address FF:0000h (for compatibility with the C51 Architecture). When PC increments beyond the end of segment FE:, it continues at the reset address FF:0000h (linearity). When PC increments beyond the end of segment 01:, it loops to the beginning of segment 00: (this prevents from its going into the reserved area). |
类似零件编号 - TSC80251G1D-L12CED |
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类似说明 - TSC80251G1D-L12CED |
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