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STC89LE53RC Folha de dados(PDF) 23 Page - STCmicro Technology Co,.Ltd |
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STC89LE53RC Folha de dados(HTML) 23 Page - STCmicro Technology Co,.Ltd |
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23 / 165 page  3.2.4 Special Function Register for RAM Some SFRs related to RAM are shown as follow. For fast data movement, STC89xx series support two data pointers. They share the same SFR address and are switched by the register bit – DPS/AUXR1.0. FF 80 Special Function Registers (SFRs) 7F 00 Low 128 Bytes Internal RAM FFFF 0000 64K Bytes External RAM External RAM High 128 Bytes Internal RAM On-chip Scratch-Pad RAM 1024 Bytes expanded RAM 03FF 0000 Auxiliary RAM Bank 0 Bank 0 Bank 0 Bank 0 bit Addressable 07H 0FH 17H 1FH 00H 08H 10H 18H 20H 30H 2FH 7FH Lower 128 Bytes of internal SRAM PSW register bit B7B6B5B4B3B2B1B0 name CY AC F0 RS1 RS0 OV F1 P CY : Carry flag. AC : Auxilliary Carry Flag.(For BCD operations) F0 : Flag 0.(Available to the user for general purposes) RS1: Register bank select control bit 1. RS0: Register bank select control bit 0. OV : Overflow flag. F1 : Flag 1. User-defined flag. P : Parity flag. 23 |
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