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TMP47C101 датащи(PDF) 5 Page - Toshiba Semiconductor |
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TMP47C101 датащи(HTML) 5 Page - Toshiba Semiconductor |
5 / 32 page TOSHIBA CORPORATION 5/32 TMP47C101/201 2.2 Program Memory (ROM) Programs and fixed data are stored in the program memory. The instruction to be executed next is read from the address indicated by the contents of the PC. The fixed data can be read by using the table look-up in- structions. • Table look-up instructions [LDL A, @DC], [LDH A, @DC+] The table look-up instructions read the lower and upper 4 bits of the fixed data stored at the address specified in the data counter (DC) to place them into the accumulator. [LDL A, @DC] instruction reads the lower 4 bits of fixed data, and [LDH A, @DC+] instruc- tion reads the upper 4 bits. The DC is a 12-bit register, allowing it to address the entire program memory space. Example: When [LDL A, @DC] instruction is executed with the DC value being 7AOH being 58H, “8” is stored in the accumulator; when [LDH A, @DC+] instruction is executed, “5” is stored in the accumulator and the DC value is incremented to 7A1H. Figure 2-2. Configuration of Program Memory 2.2.1 Program Memory Capacity The 47C101 has 1024 x 8 bits (addresses 000H through 3FFH) of program memory (mask ROM), the 47C201 has 2048 x 8 bits (addresses 000H through 7FFH). 2.2.2 Program Memory Map Figure 2-3 shows the program memory map. Address 000H - 086H of the program memory are also used for special pur- poses. On the 47C101, no physical program memory exists in the address range 400H through 7FFH. However, if this space is accessed by program, the most significant bit of each address is always regarded as “0” and the contents of the pro- gram memory corresponding to the address is always regarded as “0” and the contents of the program memory cor- responding to the address 000H through 3FFH are read. |
Аналогичный номер детали - TMP47C101 |
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Аналогичное описание - TMP47C101 |
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