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M38B71M1 Datasheet(PDF) 51 Page - Renesas Technology Corp |
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M38B71M1 Datasheet(HTML) 51 Page - Renesas Technology Corp |
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51 / 110 page 
38B7 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS 50 Fig. 50 FLD automatic display RAM assignment FLD Automatic Display RAM The FLD automatic display RAM uses the 224 bytes of addresses 0E0016 to 0EDF16. For FLD, the 3 modes of 16-timing•ordinary mode, 16-timing•gradation display mode and 32-timing mode are available depending on the number of timings and the use/not use of gradation display. The automatic display RAM in each mode is as follows: (1) 16-timing•ordinary mode This mode is used when the display timing is 16 or less. The 112 bytes of addresses 0E7016 to 0EDF16 are used as a FLD display data store area. Because addresses 0E0016 to 0E6F16 are not used as the automatic display RAM, they can be the ordinary RAM. (2) 16-timing•gradation display mode This mode is used when the display timing is 16 or less, in which mode each segment can be set for dark or bright display. The 224 bytes of addresses 0E0016 to 0EDF16 are used. The 112 bytes of addresses 0E7016 to 0EDF16 are used as an FLD display data store area, while the 112 bytes of addresses 0E0016 to 0E6F16 are used as a gradation display control data store area. (3) 32-timing mode This mode is used when the display timing is 16 or greater. This mode can be used for up to 32-timing. The 224 bytes of addresses 0E0016 to 0EDF16 are used as an FLD display data store area. The FLD data pointer (address 0EF816) is a register to count dis- play timings. This pointer has a reload register. When the pointer underflow occurs, it starts counting over again after being re- loaded with the initial value in the reload register. Make sure that (the timing counts – 1) is set to the FLD data pointer. When writing data to this address, the data is written to the FLD data pointer re- load register; when reading data from this address, the value in the FLD data pointer is read. 16-timing•ordinary mode 0EDF16 0E7016 0E0016 0EDF16 0E0016 0EDF16 0E7016 0E0016 16-timing•gradation display mode 32-timing mode 1 to 32 timing display data stored area Gradation display control data stored area 1 to 16 timing display data stored area 1 to 16 timing display data stored area Not used |
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