參數(shù)資料
型號: AT80251G2D-SLRUM
廠商: Atmel
文件頁數(shù): 16/77頁
文件大小: 0K
描述: IC 8051 MCU ROMLESS 44PLCC
標準包裝: 500
系列: 8x251
核心處理器: C251
芯體尺寸: 8/16-位
速度: 24MHz
連通性: EBI/EMI,I²C,Microwire,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器類型: ROMless
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 帶卷 (TR)
23
AT/TSC8x251G2D
4135F–8051–11/06
Table 19.
Notation for Register Operands
Register
Description
C251
C51
at Ri
A memory location (00h-FFh) addressed indirectly via byte registers
R0 or R1
–3
Rn
n
Byte register R0-R7 of the currently selected register bank
Byte register index: n = 0-7
–3
Rm
Rmd
Rms
m, md, ms
Byte register R0-R15 of the currently selected register file
Destination register
Source register
Byte register index: m, md, ms = 0-15
3
WRj
WRjd
WRjs
at WRj
at WRj +dis16
j, jd, js
Word register WR0, WR2, ..., WR30 of the currently selected register
file
Destination register
Source register
A memory location (00:0000h-00:FFFFh) addressed indirectly
through word register WR0-WR30, is the target address for jump
instructions.
A memory location (00:0000h-00:FFFFh) addressed indirectly
through word register (WR0-WR30) + 16-bit signed (two’s
complement) displacement value
Word register index: j, jd, js = 0-30
3
DRk
DRkd
DRks
at DRk
at DRk +dis16
k, kd, ks
Dword register DR0, DR4, ..., DR28, DR56, DR60 of the currently
selected register file
Destination register
Source register
A memory location (00:0000h-FF:FFFFh) addressed indirectly
through dword register DR0-DR28, DR56 and DR60, is the target
address for jump instruction
A memory location (00:0000h-FF:FFFFh) addressed indirectly
through dword register (DR0-DR28, DR56, DR60) + 16-bit (two’s
complement) signed displacement value
Dword register index: k, kd, ks = 0, 4, 8..., 28, 56, 60
3
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