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IS80LV31-24PLI Datasheet(PDF) 7 Page - Integrated Silicon Solution, Inc |
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IS80LV31-24PLI Datasheet(HTML) 7 Page - Integrated Silicon Solution, Inc |
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7 / 43 page  IS80LV51 IS80LV31 Integrated Silicon Solution, Inc. 7 ADVANCE INFORMATION MC018-0A 10/01/98 ISSI® OPERATING DESCRIPTION The detail description of the IS80LV51/31 included in this description are: • Memory Map and Registers • Timer/Counters • Serial Interface • Interrupt System • Other Information MEMORY MAP AND REGISTERS Memory The IS80LV51/31 has separate address spaces for program and data memory. The program and data memory can be up to 64K bytes long. The lower 4K program memory can reside on-chip. (IS80LV51 only) Figure 5 shows a map of the IS80LV51/31 program and data memory. The IS80LV51/31 has 128 bytes of on-chip RAM, plus numbers of special function registers. The lower 128 bytes can be accessed either by direct addressing or by indirect addressing. Figure 6 shows internal data memory organization and SFR Memory Map. The lower 128 bytes of RAM can be divided into three segments as listed below and shown in Figure 7. 1. Register Banks 0-3: locations 00H through 1FH (32 bytes). The device after reset defaults to register bank 0. To use the other register banks, the user must select them in software. Each register bank contains eight 1-byte registers R0-R7. Reset initial- izes the stack point to location 07H, and is incremented once to start from 08H, which is the first register of the second register bank. 2. Bit Addressable Area: 16 bytes have been as- signed for this segment 20H-2FH. Each one of the 128 bits of this segment can be directly addressed (0-7FH). Each of the 16 bytes in this segment can also be addressed as a byte. 3. Scratch Pad Area: 30H-7FH are available to the user as data RAM. However, if the data pointer has been initialized to this area, enough bytes should be left aside to prevent SP data destruction. FFFFH: 64K 0FFFH: 4K Program Memory (Read Only) Data Memory (Read/Write) EA = 0 External External External PSEN EA = 1 Internal 0000 00 FFFFH Internal FFH 80H 7FH 0000 RD WR Figure 5. IS80LV51/31 Program and Data Memory Structure |
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