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UPSD325X 数据表(PDF) 20 Page - STMicroelectronics |
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UPSD325X 数据表(HTML) 20 Page - STMicroelectronics |
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20 / 176 page  µPSD325X DEVICES 20/176 SFR The SFRs can only be addressed directly in the address range from 80h to FFh. Table 15, page 32 gives an overview of the Special Function Regis- ters. Sixteen address in the SFRs space are both- byte and bit-addressable. The bit-addressable SFRs are those whose address ends in 0h and 8h. The bit addresses in this area are 80h to FFh. Table 3. RAM Address Addressing Modes The addressing modes in µPSD325X devices in- struction set are as follows s Direct addressing s Indirect addressing s Register addressing s Register-specific addressing s Immediate constants addressing s Indexed addressing (1) Direct addressing. In a direct addressing the operand is specified by an 8-bit address field in the instruction. Only internal Data RAM and SFRs (80~FFH RAM) can be directly addressed. Example: mov A, 3EH ; A <----- RAM[3E] Figure 11. Direct Addressing (2) Indirect addressing. In indirect addressing the instruction specifies a register which contains the address of the operand. Both internal and ex- ternal RAM can be indirectly addressed. The ad- dress register for 8-bit addresses can be R0 or R1 of the selected register bank, or the Stack Pointer. The address register for 16-bit addresses can only be the 16-bit “data pointer” register, DPTR. Example: mov @R1, #40 H ;[R1] <-----40H Figure 12. Indirect Addressing Byte Address (in Hexadecimal) Byte Address (in Decimal) ↓↓ FFh 255 30h 48 msb Bit Address (Hex) lsb 2Fh 7F 7E 7D 7C 7B 7A 79 78 47 2Eh 77 76 75 74 73 72 71 70 46 2Dh 6F 6E 6D 6C 6B 6A 69 68 45 2Ch 67 66 65 64 63 62 61 60 44 2Bh 5F 5E 5D 5C 5B 5A 59 58 43 2Ah 57 56 55 54 53 52 51 50 42 29h 4F 4E 4D 4C 4B 4A 49 48 41 28h 47 46 45 44 43 42 41 40 40 27h 3F 3E 3D 3C 3B 3A 39 38 39 26h 37 36 35 34 33 32 31 30 38 25h 2F 2E 2D 2C 2B 2A 29 28 37 24h 27 26 25 24 23 22 21 20 36 23h 1F 1E 1D 1C 1B 1A 19 18 35 22h 17 16 15 14 13 12 11 10 34 21h 0F 0E 0D 0C 0B 0A 09 08 33 20h 07 06 05 04 03 02 01 00 32 1Fh Register Bank 3 31 18h 24 17h Register Bank 2 23 10h 16 0Fh Register Bank 1 15 08h 8 07h Register Bank 0 7 00h 0 AI06641 3Eh Program Memory 04 A AI06642 R1 55h Program Memory 55 40h |
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