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P80CE562EHA Datasheet(PDF) 10 Page - NXP Semiconductors |
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P80CE562EHA Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 52 page  1997 Apr 08 10 Philips Semiconductors Product specification 8-bit microcontroller P83C562; P80C562 8.2 Addressing The P8xC562 has five methods for addressing source operands: • Register • Direct • Register-Indirect • Immediate • Base-Register plus Index-Register-Indirect. The first three methods can be used for addressing destination operands. Most instructions have a 'destination/source' field that specifies the data type, addressing methods and operands involved. For operations other than MOVs, the destination operand is also a source operand. Access to memory addressing is as follows: • Registers in one of the four 8-register banks through Register, Direct or Register-Indirect • 256 bytes of internal data RAM through Direct or Register-Indirect. Bytes 0 to 127 may be addressed directly/indirectly. Bytes 128 to 155 share their address locations with the SFR registers and so may only be addressed indirectly as data RAM • Special Function Registers through Direct at address locations 128 to 255 • External data memory through Register-Indirect • Program memory look-up tables through Base-Register plus Index-Register-Indirect. The P8xC562 is classified as an 8-bit device since the internal ROM, RAM, Special Function Registers, Arithmetic Logic Unit and external data bus are all 8-bits wide. It performs operations on bit, nibble, byte and double-byte data types. Facilities are available for byte transfer, logic and integer arithmetic operations. Data transfer, logic and conditional branch operations can be performed directly on Boolean variables to provide excellent bit handling. Fig.4 Memory map. handbook, full pagewidth MBC745 INDIRECT ONLY DIRECT AND INDIRECT 255 127 0 EXTERNAL (EA = 0) INTERNAL (EA = 1) INTERNAL DATA MEMORY EXTERNAL DATA MEMORY PROGRAM MEMORY EXTERNAL 64K 64K 8192 8191 0 OVERLAPPED SPACE 0 8191 0 SPECIAL FUNCTION REGISTERS |
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