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UPD17708 データシート(PDF) 93 Page - NEC |
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UPD17708 データシート(HTML) 93 Page - NEC |
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93 / 356 page  93 µPD17704, 17705, 17707, 17708, 17709 10.3 Data Buffer Stack Pointer The data buffer stack pointer detects the multiplexing level of the data buffer stack registers. When the “PUT” instruction is executed to the data buffer stack, the value of the data buffer stack pointer is incremented by one; when the “GET” instruction is executed, the value of the pointer is decremented by one. The data buffer stack pointer can be only read and cannot be written. The configuration and function of the data buffer stack pointer are illustrated below. Name Flag symbol b3 0 b2 0 b1 D B F S P 1 b0 D B F S P 0 Address 04H Read/Write R Data buffer stack pointer Power-ON reset WDT&SP reset CE reset Clock stop 0 1 0 1 Level 0 Level 1 Level 2 Level 3 Detects multiplexing level of data buffer stack 0 0 1 1 Retained Fixed to “0” 00 0 0 0 0 0 0 |
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