Document Title: [feature.txt (text file)]
GTE G 65 SC 802 / G 65 SC 816 Microcircuits CMOS 8/16-Bit Microprocessor Family Features Advanced CMOS design for low power consumption and increased noise immunity Emulation mode for total software compatibility with 6502 designs Full 16-bit ALU, Accumulator, Stack Pointer, and Index Registers Direct Register for ''zero page'' addressing 24 addressing modes (including 13 original 6502 modes) Wait for Interrupt (WAI) and Stop the Clock (STP) instructions for reduced power consumption and decreased interrupt latency 91 instructions with 255 opcodes Co-Processor (COP) instruction and associated vector Powerful Block Move instructions Features (G65SC802 Only) 8-Bit Mode with both software and hardware (pin-to-pin) compatibility with 6502 designs (64 KByte memory space) Program selectable 16-bit operation Choice of external or on-board clock generation Features (G65SC816 Only) Full 16-bit operation with 24 address lines for 16 MByte memory Program selectable 8-Bit Mode for 6502 coding compatibility. Valid Program Address (VPA) and Valid Data Address (VDA) outputs for dual cache and DMA cycle steal implementation Vector Pull (VP) output indicates when interrupt vectors are being fetched. May be used for vectoring/prioritizing interrupts. Abort interrupt and associated vector for interrupting any instruction without modifying internal registers Memory Lock (ML) for multiprocessor system implementation General Description The G65SC802 and G65SC816 are ADV-CMOS (ADVanced CMOS) 16-bit microprocessors featuring total software compatibility with 8-bit NMOS and CMOS 6500 series microprocessors. The G65SC802 is pin-to-pin compatible with 8-bit 6502 devices currently available, while also providing full 16-bit internal operation. The G65SC816 provides 24 address lines for 16 MByte addressing, while providing both 8-bit and 16-bit operation. Each microprocessor contains an Emulation (E) mode for emulating 8-bit NMOS and CMOS 6500-Series microprocessors. A software switch determines whether the processor is in the 8-bit ernulation mode or in the Native 16-bit mode. This allows existing 8-bit system designs to use the many powerful features of the G65SC802 and G65SC816. The G65SC802 and G65SC816 provide the system engineer with many powerful features and options. A 16-bit Direct Page Register is provided to augment the Direct Page addressing mode, and there are separate Program Bank Registers for 24-bit memory addressing. Other valuable features Include: * An Abort input which can interrupt the current instruction without modifying internal registers * Valid Data Address (VDA) and Valid Program Address (VPA) outputs which facilitate dual cache memory by indicating whether a data or program segment is being accessed. * Vector modification by simply monitoring the Vector Pull (VP) output. * Block Move Instructions G65SC802 and G65SC816 microprocessors offer the design engineer a new freedom of design and application, and the many advantages of state-of-the-art ADV-CMOS technology. This is advanced information and specifications are subject to change without notice. }