W742C814 データシートの表示（PDF） - Winbond

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W742C814

4-BIT MICROCONTROLLER

Winbond 

W742C814

Bit 3 is reserved

Bit 2, Bit 1, Bit 0 Data memory bank preselect bits:

000 = Data bank 0 (000H - 07FH)

001 = Data bank 1 (080H - 0FFH)

010 = Data bank 2 (100H - 17FH)

011 = Data bank 3 (180H - 1FFH)

100 = Data bank 4 (200H - 27FH)

101 = Data bank 5 (280H - 2FFH)

110 = Data bank 6 (300H - 37FH)

111 = Data bank 7 (380H - 3FFH)

6.5 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.

6.6 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 MOV R, CF.

6.7 Oscillator

The W742C814 provides a crystal oscillation circuit to generate the system clock through external

connections. The 32768 Hz crystal be connected to XIN and XOUT, and a capacitor must be

connected to XIN and XOUT if an accurate frequency is needed.

Crystal

32768 Hz

XIN

XOUT

Figure 6-3 System Clock Oscillator Configuration

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Publication Release Date: February 12, 2003

Revision A2

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