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4Bit Microprocessors and the TMS1000 Series Microcomputers
The PPS41 150
Data Sheets 2D1
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8048 series microcomputers Accumulator Address Bus address lines Bidirectional buffer Channel chip clock periods clock signal Control code Control register Control register bit control signals Counter register counter/timer Current Data Bus Data Counter decrement Delay Direct Memory Access disabled Enable external interrupt external logic Halt high-order byte I/O Port illustrated as follows Index Register Input High Input Low instruction execution instruction fetch instruction set Interface Logic internal interrupt acknowledge interrupt logic interrupt request interrupt service routine Interval Timer Latch lnput Load low-order byte machine cycle memory address memory location microcomputer system microprocessor object code operation options pins and signals priority Program Counter program memory Pulse Width read/write register contents reset Rising Edge SC/MP scratchpad serial data Stack Pointer Status register Status register bit Strobe subroutine support devices SYNC System Bus Table vector Volts write