參數(shù)資料
型號(hào): W921E400A
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-Bit Microcontroller(4位微控制器)
中文描述: 4-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP28
封裝: DIP-28
文件頁(yè)數(shù): 42/53頁(yè)
文件大?。?/td> 394K
代理商: W921E400A
W921E400A/W921C400
- 42 -
9. ADDRESSING MODE
There are ROM, RAM, and Look-up table addressing modes in this chip.
9.1 ROM Addressing Mode
There are three types of ROM addressing mode in this chip:
Indirect call addressing mode (0000H to 0FFFH )
Long call/jump addressing mode (0000H to 0FFFH )
9.1.1 Indirect Call Addressing Mode: (1 word/2 cycles)
b3 b2 b1 b0
b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
PC
decoder code
b3 b2 b1 b0
i3 i2 i1 i0
B Register
A Register
i3 i2 i1 i0 b3 b2 b1 b0 a3 a2 a1 a0
ROM CODE
9.1.2 Long Call/Jump Addressing Mode: (2 words/2 cycles)
Instruction: CALLP
b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
decoder code
ROM CODE
PC
Instruction: CALL, JMPL, JB0, JB1, JB2, JB3, JC, JNC, JZ, JNZ
9.2 RAM Addressing Mode
There are three types of RAM addressing mode in this chip:
Direct addressing mode
Indirect addressing mode
Working register addressing mode
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