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UPD17704 データシート(PDF) 93 Page - Renesas Technology Corp |
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UPD17704 データシート(HTML) 93 Page - Renesas Technology Corp |
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93 / 358 page  91 µPD17704, 17705, 17707, 17708, 17709 10. DATA BUFFER STACK 10.1 Outline of Data Buffer Stack Figure 10-1 outlines the data buffer stack. As shown in the figure, the data buffer stack consists of a data buffer stack pointer and data buffer stack registers. The data buffer stack saves or restores the contents of the data buffer when the “PUT” or “GET” instruction is executed. Therefore, the contents of the data buffer can be saved by one instruction when an interrupt is accepted. Figure 10-1. Outline of Data Buffer Stack 10.2 Data Buffer Stack Register Figure 10-2 shows the configuration of the data buffer stack registers. As shown in the figure, the data buffer stack registers consist of four 16-bit registers. The contents of the data buffer are saved by executing the “PUT” instruction, and the saved data is restored by executing the “GET” instruction. The data buffer contents can be successively saved up to 4 levels. Data buffer stack pointer DBF Data buffer stack registers Address specification |
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