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71M6532D/F Datasheet(PDF) 21 Page - Maxim Integrated Products |
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71M6532D/F Datasheet(HTML) 21 Page - Maxim Integrated Products |
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21 / 121 page  FDS 6531/6532 005 Data Sheet 71M6531D/F-71M6532D/F Rev 2 21 An alternative data pointer is available in the form of the PDATA register (SFR 0xBF), sometimes referred to as USR2). It defines the high byte of a 16-bit address when reading or writing XDATA with the instruction MOVX A,@Ri or MOVX @Ri,A. Internal Data Memory Map and Access The Internal data memory provides 256 bytes (0x00 to 0xFF) of data memory. The internal data memory address is always 1 byte wide. Table 8 shows the internal data memory map. The Special Function Registers (SFR) occupy the upper 128 bytes. The SFR area of internal data memory is available only by direct addressing. Indirect addressing of this area accesses the upper 128 bytes of Internal RAM. The lower 128 bytes contain working registers and bit addressable memory. The lower 32 bytes form four banks of eight registers (R0-R7). Two bits on the program memory status word (PSW) select which bank is in use. The next 16 bytes form a block of bit addressable memory space at bit addresses 0x00-0x7F. All of the bytes in the lower 128 bytes are accessible through direct or indirect addressing. Table 8: Internal Data Memory Map Address Range Direct addressing Indirect addressing 0x80 0xFF Special Function Registers (SFRs) RAM 0x30 0x7F Byte addressable area 0x20 0x2F Bit addressable area 0x00 0x1F Register banks R0…R7 1.4.2 Special Function Registers (SFRs) A map of the Special Function Registers is shown in Table 9. Only a few addresses in the SFR memory space are occupied, the others are not implemented. A read access to unimplemented addresses will return undefined data, while a write access will have no effect. SFRs specific to the 71M6531D/F and 71M6532D/F are shown in bold print on a gray field. The registers at 0x80, 0x88, 0x90, etc., are bit addressable, all others are byte addressable. See the restrictions for the INTBITS register in Table 14. Table 9: Special Function Register Map Hex/ Bin Bit Addressable Byte Addressable Bin/ Hex X000 X001 X010 X011 X100 X101 X110 X111 F8 INTBITS FF F0 B F7 E8 IFLAGS EF E0 A E7 D8 WDCON DF D0 PSW D7 C8 T2CON CF C0 IRCON C7 B8 IEN1 IP1 S0RELH S1RELH PDATA BF B0 P3 FLSHCTL FL_BANK PGADR B7 A8 IEN0 IP0 S0RELL AF A0 P2 DIR2 DIR0 A7 98 S0CON S0BUF IEN2 S1CON S1BUF S1RELL EEDATA EECTRL 9F 90 P1 DIR1 DPS ERASE 97 88 TCON TMOD TL0 TL1 TH0 TH1 CKCON 8F 80 P0 SP DPL DPH DPL1 DPH1 PCON 87 |
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