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HT85F2250 Datasheet(PDF) 49 Page - Holtek Semiconductor Inc |
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HT85F2250 Datasheet(HTML) 49 Page - Holtek Semiconductor Inc |
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49 / 187 page  Rev. 1.10 49 of 187 ���� �1� �01� A/D Flash 8051 Core Low Pin Count MCU HT85F2250/HT85F2262 Bit Addressable Space Some instructions in the 8051 language allow for single bit addressing. These single bit instructions can only be used in the bit addressable data memory area, located both in the General Purpose Data RAM and the Special Function Register area. Note that these bit addressable registers are both byte and bit addressable. The 16 bytes bit addressable registers of the General Purpose Data RAM, located from 20H to 2FH, can address up to 128 individual bits. Each bit has its corresponding bit address from 00H to 7FH. For example, bit 0 of the 20H register is mapped to the bit address 00H, bit 7 of the 20H register is mapped to the bit address 07H and bit 7 of the 2FH register is mapped to the bit address 7FH. The accompanying table illustrates the Bit-Addressable register map description for General Purpose Data RAM, 20H ~ 2FH. Using the bit operational instruction, such as SETB or CLR on the bit address can implement operations on the corresponding bit of the register. For example: SETB 00H ; Set the bit 0 of the register location 20H to “1” SETB 07H ; Set the bit 7 of the register location 20H to “1” CLR 25H ; Clear the bit 5 of the register location 24H to “0” CLR 7FH ; Clear the bit 7 of the register location 2FH to “0” General Purpose Data RAM, 20H~2FH, Bit Address Map High 5-bit Address Low 3-bit Address 0H 1H 2H 3H 4H 5H 6H 7H 78H 0x�F.0 0x�F.1 0x�F.� 0x�F.� 0x�F.4 0x�F.� 0x�F.6 0x�F.7 70H 0x�E.0 0x�E.1 0x�E.� 0x�E.� 0x�E.4 0x�E.� 0x�E.6 0x�E.7 68H 0x�D.0 0x�D.1 0x�D.� 0x�D.� 0x�D.4 0x�D.� 0x�D.6 0x�D.7 60H 0x�C.0 0x�C.1 0x�C.� 0x�C.� 0x�C.4 0x�C.� 0x�C.6 0x�C.7 �8H 0x�B.0 0x�B.1 0x�B.� 0x�B.� 0x�B.4 0x�B.� 0x�B.6 0x�B.7 �0H 0x�A.0 0x�A.1 0x�A.� 0x�A.� 0x�A.4 0x�A.� 0x�A.6 0x�A.7 48H 0x�9.0 0x�9.1 0x�9.� 0x�9.� 0x�9.4 0x�9.� 0x�9.6 0x�9.7 40H 0x�8.0 0x�8.1 0x�8.� 0x�8.� 0x�8.4 0x�8.� 0x�8.6 0x�8.7 �8H 0x�7.0 0x�7.1 0x�7.� 0x�7.� 0x�7.4 0x�7.� 0x�7.6 0x�7.7 �0H 0x�6.0 0x�6.1 0x�6.� 0x�6.� 0x�6.4 0x�6.� 0x�6.6 0x�6.7 �8H 0x��.0 0x��.1 0x��.� 0x��.� 0x��.4 0x��.� 0x��.6 0x��.7 �0H 0x�4.0 0x�4.1 0x�4.� 0x�4.� 0x�4.4 0x�4.� 0x�4.6 0x�4.7 18H 0x��.0 0x��.1 0x��.� 0x��.� 0x��.4 0x��.� 0x��.6 0x��.7 10H 0x��.0 0x��.1 0x��.� 0x��.� 0x��.4 0x��.� 0x��.6 0x��.7 08H 0x�1.0 0x�1.1 0x�1.� 0x�1.� 0x�1.4 0x�1.� 0x�1.6 0x�1.7 00H 0x�0.0 0x�0.1 0x�0.� 0x�0.� 0x�0.4 0x�0.� 0x�0.6 0x�0.7 |
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