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W741E204 Datasheet(PDF) 8 Page - Winbond |
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W741E204 Datasheet(HTML) 8 Page - Winbond |
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8 / 84 page  Preliminary W741E20X - 8 - The first sixteen addresses (00H to 0FH) in the data memory are known as the working registers (WR). The other data memory is used as general memory and cannot operate directly with immediate data. The relationship between data memory locations and the page register (PAGE) in indirect addressing mode is described in the next section. 2. Page Register (PAGE) The page register is organized as a 4-bit binary register. The bit descriptions are as follows: R/W R/W R/W 0 1 2 3 PAGE _ Note: R/W means read/write available. Bit 3 is reserved. Bit 2, Bit 1, Bit 0 Indirect addressing mode preselect bits: 000 = Page 0 (00H - 0FH) 001 = Page 1 (10H - 1FH) 010 = Page 2 (20H - 2FH) 011 = Page 3 (30H - 3FH) 100 = Page 4 (40H - 4FH) 101 = Page 5 (50H - 5FH) 110 = Page 6 (60H - 6FH) 111 = Page 7 (70H - 7FH) Accumulator (ACC) The accumulator (ACC) is a 4-bit register used to hold results from the ALU and transfer data between the memory, I/O ports, and registers. Arithmetic and Logic Unit (ALU) This is a circuit which performs arithmetic and logic operations. The ALU provides the following functions: • Logic operations: ANL, XRL, ORL • Branch decisions: JB0, JB1, JB2, JB3, JNZ, JZ, JC, JNC, DSKZ, DSKNZ, SKB0, SKB1, SKB2, SKB3 • Shift operations: SHRC, RRC, SHLC, RLC • Binary additions/subtractions: ADC, SBC, ADD, SUB, ADU, DEC, INC After any of the above instructions are executed, the status of the carry flag (CF) and zero flag (ZF) is stored in the internal registers. CF can be read out by executing MOVA R, CF. |
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