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AS8228 Datasheet(PDF) 88 Page - ams AG |
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AS8228 Datasheet(HTML) 88 Page - ams AG |
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88 / 123 page  Data Sheet AS8218 / AS8228 Revision 3.0, 31-May-06 Page 88 of 123 Internal Memory (I_RAM) 128 bytes of I_RAM are provided, which can be accessed via 3 address modes. - All memory 00h to 7Fh is directly addressable. - 00h to 1Fh are register addressable in four banks. Bank switching is done in PSW (Program Status Word). - 20h to 2Fh are bit addressable, which means that each bit of these registers can be set/cleared separately. I_R AM Locations 78h 79h 7Ah 7Bh 7Ch 7Dh 7Eh 7Fh 70h 71h 72h 73h 74h 75h 76h 77h 68h 69h 6Ah 6Bh 6Ch 6Dh 6Eh 6Fh 60h 61h 62h 63h 64h 65h 66h 67h 58h 59h 5Ah 5Bh 5Ch 5Dh 5Eh 5Fh 50h 51h 52h 53h 54h 55h 56h 57h 48h 49h 4Ah 4Bh 4Ch 4Dh 4Eh 4Fh 40h 41h 42h 43h 44h 45h 46h 47h 38h 39h 3Ah 3Bh 3Ch 3Dh 3Eh 3Fh 30h 31h 32h 33h 34h 35h 36h 37h 28h bit 40-47 29h bit 48-4F 2Ah bit 50-57 2Bh bit 58-5F 2Ch bit 60-67 2Dh bit 68-6F 2Eh bit 70-77 2Fh bit 78-7F 20h bit 00-07 21h bit 08-0F 22h bit 10-17 23h bit 18-1F 24h bit 20-27 25h bit 28-2F 26h bit 30-37 27h bit 38-3F 18h R0 19h R1 1Ah R2 1Bh R3 1Ch R4 1Dh R5 1Eh R6 1Fh R7 10h R0 11h R1 12h R2 13h R3 14h R4 15h R5 16h R6 17h R7 08h R0 09h R1 0Ah R2 0Bh R3 0Ch R4 0Dh R5 0Eh R6 0Fh R7 00h R0 01h R1 02h R2 03h R3 04h R4 05h R5 06h R6 07h R7 The first 4 x 8 bytes of the internal memory can be addressed via instructions using the register addressing mode (register bank 0, 1, 2, 3). The following 16 bytes (16 x 8 = 128 bits, address 20h to 2Fh) can be addressed via instructions using the direct-bit addressing mode. The address space from 30h to 7Fh is accessible via the direct addressing mode only. Gray-shaded R0 and R1 registers can be used for register indirect addressing. Special Function Registers (SFR) The following table shows the locations of the Special Function Registers. SFRs in bold style are original 8051 registers. SFRs in italic style are additional registers specific to the AS8218 / AS8228 ICs. |
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