参数资料
| 型号： | AT80251G2D-SLSUM |
| 厂商： | Atmel |
| 文件页数： | 15/77页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU ROMLESS 44PLCC |
| 标准包装： | 972 |
| 系列： | 8x251 |
| 核心处理器： | C251 |
| 芯体尺寸： | 8/16-位 |
| 速度： | 24MHz |
| 连通性： | EBI/EMI，I²C，Microwire，SPI，UART/USART |
| 外围设备： | POR，PWM，WDT |
| 输入/输出数： | 32 |
| 程序存储器类型： | ROMless |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-LCC（J 形引线） |
| 包装： | 管件 |
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22
AT/TSC8x251G2D
4135F–8051–11/06
Table 16.
Notation for Immediate Addressing
Table 17.
Notation for Bit Addressing
Table 18.
Notation for Destination in Control Instructions
Immediate
Address
Description
C251
C51
#data
An 8-bit constant that is immediately addressed in an instruction
3
#data16
A 16-bit constant that is immediately addressed in an instruction
3
–
#0data16
#1data16
A 32-bit constant that is immediately addressed in an instruction. The
upper word is filled with zeros (#0data16) or ones (#1data16).
3–
#short
A constant, equal to 1, 2, or 4, that is immediately addressed in an
instruction.
3–
Direct
Address
Description
C251
C51
bit51
A directly addressed bit (bit number = 00h-FFh) in memory or an
SFR. Bits 00h-7Fh are the 128 bits in byte locations 20h-2Fh in the
on-chip RAM. Bits 80h-FFh are the 128 bits in the 16 SFRs with
addresses that end in 0h or 8h, S:80h, S:88h, S:90h,..., S:F0h,
S:F8h.
–
3
bit
A directly addressed bit in memory locations 00:0020h-00:007Fh or
in any defined SFR.
3
Direct
Address
Description
C251
C51
rel
A signed (two’s complement) 8-bit relative address. The destination
is -128 to +127 bytes relative to the next instruction’s first byte.
33
addr11
An 11-bit target address. The target is in the same 2-Kbyte block of
memory as the next instruction’s first byte.
–3
addr16
A 16-bit target address. The target can be anywhere within the same
64-Kbyte region as the next instruction’s first byte.
–3
addr24
A 24-bit target address. The target can be anywhere within the 16-
Mbyte address space.
3–
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