W742E816 查看數據表（PDF） - Winbond

零件编号

产品描述 (功能)

比赛名单

W742E816

4-BIT MICROCONTROLLER

Winbond 

W742E/C816

Deleted: SA5505

Deleted: W742C811

2. Working Register Addressing

Bit 7-0 7 6 5 4 3 2 1 0

RAM addr WP3 WP2 WP1 WP0 WA3 WA2 WA1 WA0

WA0-3 is Working register address ; WP0-3 is WR page register(WRP)

Example:

MOV

MOV

MOV

MOVA

3. Indirect Addressing

DBKRL, #BL_value

DBKRH, #BH_value

WRP, #I

WRn, RAM

; set RAM bank

; set WR page register

; mov RAM data to Working register and ACC

Bit 12-0 12 11 10 9 8 7 6 5 4 3 2 1 0

RAM addr BH1 BH0 BL3 BL2 BL1 BL0 DP2 DP1 DP0 (WA3 WA2 WA1 WA0)

(WA0-3) is Working register contents ; DP0-3 is RAM page register(PAGE)

BL0-3 is DBKRL register ; BH0-1 is DBKRH register

Example:

MOV

MOV

MOV

MOV

MOV

DBKRL, BL_value

DBKRH, BH_value

PAGE, #Ip

WRq, #In

WRn, @WRq

; set RAM bank

; set RAM page address, (0 − 07H)

; set WR pointer address; (0 − 0FH)

; get the contents of WRq pointing addr to WRn

5.5 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.

5.6 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 is 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.

- 15 -

Publication Release Date: April 15, 2005

Revision A2

Share Link: