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SC73P1601 Datasheet(PDF) 6 Page - Silan Microelectronics Joint-stock |
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SC73P1601 Datasheet(HTML) 6 Page - Silan Microelectronics Joint-stock |
6 / 22 page SC73P1601 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.4 2009.08.03 Http: www.silan.com.cn Page 6 of 22 2. MBR Memory buffer register (MBR) is write-only, higher 4-bit of the program pointer. The EPROM of SC73P1601 can be divided into 8 blocks. Each block is 128 bytes. The 8 blocks can be addressed by the MBR. When the program starts executing a branch instruction, it must load the corresponding value to the MBR register, and then executes the command BSS label. 3. STACK Stack register stores the previous value of program pointer during execution of subroutine calls, 11 bits. There is two-level hardware stack register, so two-level programs can be called. When the user tries to make more than two-level program call, an error will occur. 4. B, H, D Referred to as the pointer to data table. BHD are separately 2 bits, 4 bits and 4 bits. The 1K EPROM space of SC73P1601 can be used as the data table which can be diplex with program space. When addressing the fixed data of EPROM, the registers act as the pointers to the data table (to form the EPROM address according to BHD order). In other cases, the H, D registers can be used as general purpose registers. Fixed data stored in the data table can be addressed by the transmit instructions. When executing the transmit-instructions, the program will look for the data from the correspond space of EPROM. The low 10 bits address of the EPROM are composed of two lower bits of B , four bits of H and four bits of D. When the most significant bit is 1, P53 transmits the data with carrier; while the most significant bit is 0, P53 transmits the data without carrier. The second bit of B is of no real use, and it is set 0 by the software at program imitation. 5. PROM Address 1k x 9bits 000H 001H 002H 01FH Subroutine call start address 020H 3FFH Normal program Area (can be duplex as data table) 6. CH0、CH1、CL0、CL1 CH0, CH1, CL0, CL1 are carrier high and low level control registers, which can control the high-low level of carrier is (CH+1)/fosc and(CL+1)/fosc. |
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