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UPD784915B Datasheet(PDF) 53 Page - NEC |
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UPD784915B Datasheet(HTML) 53 Page - NEC |
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53 / 86 page  µPD784915B, 784916B 53 (3) Macro service type A When an interrupt request occurs, data is transferred from an 8-/16-bit SFR to memory (byte/word) or from memory (byte/word) to an 8-/16-bit SFR. Data is transferred the number of times set in advance by the macro service counter. This mode can be used to store the result of A/D conversion or for automatic transfer (or reception) by the serial interface. Because transfer data is stored at an address FE00H to FEFFH, if only a small quantity of data is to be transferred, the data can be transferred at high speeds. When the value of the macro service counter is decremented to 0, a vector interrupt request occurs. (4) Data pattern identification mode (VISS detection mode) This mode of macro service is for detection of the VISS signal and is used in combination with a pulse width detection circuit. When an interrupt request occurs, the content of bit 7 of an SFR (usually, TMC3) specified by SFR pointer 1 is shifted into the buffer area. At the same time, the data in the buffer area is compared with the data in the compare area. If the two data coincide, an interrupt request is generated. When the value of the macro service counter is decremented to 0, a vector interrupt request occurs. It can be specified by option that the value of an SFR (usually, CPT30) specified by SFR pointer 2 be multiplied by a coefficient and the result of this multiplication be stored to an SFR (usually, CR30) specified by SFR pointer 3 (this operation is to automatically update an identification threshold value when the tape speed fluctuates). Data storage buffer (memory) Data n Data n - 1 Data 2 Data 1 SFR Internal bus Data storage buffer (memory) Data n Data n - 1 Data 2 Data 1 SFR Internal bus Coefficient (memory) CPT30 TM3 CR30 Multiplier Buffer area (memory) Compare area (memory) Coincidence CTL F/F (bit 7 of TMC3) Vector interrupt |
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