参数资料
型号: AT80251G2D-SLRUM
厂商: Atmel
文件页数: 9/77页
文件大小: 0K
描述: IC 8051 MCU ROMLESS 44PLCC
标准包装: 500
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: 带卷 (TR)
17
AT/TSC8x251G2D
4135F–8051–11/06
Configuration Bytes
The TSC80251G2D derivatives provide user design flexibility by configuring certain
operating features at device reset. These features fall into the following categories:
external memory interface (Page mode, address bits, programmed wait states and
the address range for RD#, WR#, and PSEN#)
source mode/binary mode opcodes
selection of bytes stored on the stack by an interrupt
mapping of the upper portion of on-chip code memory to region 00:
Two user configuration bytes UCONFIG0 (see Table 11) and UCONFIG1 (see Table
12) provide the information.
When EA# is tied to a low level, the configuration bytes are fetched from the external
address space. The TSC80251G2D derivatives reserve the top eight bytes of the mem-
ory address space (FF:FFF8h-FF:FFFFh) for an external 8-byte configuration array.
Only two bytes are actually used: UCONFIG0 at FF:FFF8h and UCONFIG1 at
FF:FFF9h.
For the mask ROM devices, configuration information is stored in on-chip memory (see
ROM Verifying). When EA# is tied to a high level, the configuration information is
retrieved from the on-chip memory instead of the external address space and there is no
restriction in the usage of the external memory.
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