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SC73P1601M Datasheet(PDF) 7 Page - Silan Microelectronics Joint-stock |
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SC73P1601M Datasheet(HTML) 7 Page - Silan Microelectronics Joint-stock |
7 / 22 page SC73P1601 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.4 2009.08.03 Http: www.silan.com.cn Page 7 of 22 7. LL, LH LL register, 4 bits, LH register, bit. LL[3:0] is the address pointer of RAM, and is used as the general-purpose register at the same time. LH register, 4 bits, used as the general-purpose register. 8. RAM Data memory consists of 16x4 bits and is used to store temporary data and results after a program is executed. It can address the entire RAM areas by the pointer LL[3:0]. When reset, the contents of RAM are not defined. We recommend users to initialize it at the beginning of their software program. 9. ALU The arithmetic and logic unit plays a leading role in performing various operations of 4-bit binaries. The operation of ALU will change the carry flag (CF) and the zero flag(ZF). 10. Acc 4-bit accumulator, which is in the ALU. It is mostly used to store data and results. 11. CF Carry flag. 12. SF Status flag bit, the value of SF is 1 after reset. 13. PR (PR, PR2) The port mode register, which specifies the input mode or output mode of the I/O port, is 4-bit write-only. When the value is 1, the corresponding port is set to output mode. PR=0, it is set to input mode. The execution of the HOLD instruction won’ t affect the I/O modes of operation. When reset, the initialization value is 0000B, and the port is in input mode. P52 mode select PR2.2 PR2.1 PR2.0 P51 mode select P50 mode select -- |
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