参数资料
型号: AT80251G2D-SLSUM
厂商: Atmel
文件页数: 13/77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
20
AT/TSC8x251G2D
4135F–8051–11/06
Configuration Byte 1
Table 13.
Address Ranges and Usage of RD#, WR# and PSEN# Signals
Notes: 1. This selection provides compatibility with the standard 80C51 hardware which has
separate external memory spaces for data and code.
RD1
RD0
P1.7
P3.7/RD#
PSEN#
WR#
External
Memory
00
A17
A16
Read signal for all
external memory
locations
Write signal for all
external memory
locations
256 KB
0
1
I/O pin
A16
Read signal for all
external memory
locations
Write signal for all
external memory
locations
128 KB
1
0
I/O pin
Read signal for all
external memory
locations
Write signal for all
external memory
locations
64 KB
1
I/O pin
Read
signal for
regions 00:
and 01:
Read signal for
regions FE: and FF:
Write signal for all
external memory
locations
2
× 64 KB(1)
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