W742E816 Просмотр технического описания (PDF) - Winbond

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W742E816

4-BIT MICROCONTROLLER

Winbond 

W742E/C816

Deleted: SA5505

Deleted: W742C811

The 1st and 2nd data bank (00H to 7FH & 80H to 0FFH) in the data memory can also be used as the

working registers (WR). It is also divided into sixteen pages. Each page contains 16 working registers.

When one page is used as Working Register, the others can be used as the normal data memory. The

WR page register can be switched by executing the MOV WRP, R or MOV WRP, #I instructions. The

data memory can not do the logical operation directly with the immediate data, it has to via the

Working Register.

5.4.2 RAM Page Register (PAGE)

The page register is organized as a 4-bit binary register. The bit descriptions are as follows:

3

2

1

0

PAGE

R/W R/W R/W

Note: R/W means read/write available.

Bit 3 is reserved.

Bit 2, Bit 1, Bit 0 RAM page 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)

5.4.3 WR Page Register (WRP)

The WR page register is organized as a 4-bit binary register. The bit descriptions are as follows:

3

2

1

0

WRP R/W R/W R/W R/W

Note: R/W means read/write available.

Bit 3, Bit 2, Bit 1, Bit 0 Working registers page bits:

0000 = WR Page 0 (00H − 0FH)

0001 = WR Page 1 (10H − 1FH)

0010 = WR Page 2 (20H − 2FH)

0011 = WR Page 3 (30H − 3FH)

0100 = WR Page 4 (40H − 4FH)

0101 = WR Page 5 (50H − 5FH)

0110 = WR Page 6 (60H − 6FH)

0111 = WR Page 7 (70H − 7FH)

1000 = WR Page 8 (80H − 8FH)

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