参数资料
型号: AT80251G2D-SLRUM
厂商: Atmel
文件页数: 10/77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)
18
AT/TSC8x251G2D
4135F–8051–11/06
Table 11.
Configuration Byte 0
UCONFIG0
Notes: 1. UCONFIG0 is fetched twice so it can be properly read both in Page or Non-Page
modes. If P2.1 is cleared during the first data fetch, a Page mode configuration is
used, otherwise the subsequent fetches are performed in Non-Page mode.
2. This selection provides compatibility with the standard 80C51 hardware which is mul-
tiplexing the address LSB and the data on Port 0.
7654
3210
-
WSA1#
WSA0#
XALE#
RD1
RD0
PAGE#
SRC
Bit Number
Bit
Mnemonic
Description
7-
Reserved
Set this bit when writing to UCONFIG0.
6WSA1#
Wait State A bits
Select the number of wait states for RD#, WR# and PSEN# signals for external
memory accesses (all regions except 01:).
WSA1#
WSA0#
Number of Wait States
00
3
01
2
10
1
11
0
5WSA0#
4XALE#
Extend ALE bit
Clear to extend the duration of the ALE pulse from TOSC to 3TOSC.
Set to minimize the duration of the ALE pulse to 1TOSC.
3
RD1
Memory Signal Select bits
Specify a 18-bit, 17-bit or 16-bit external address bus and the usage of RD#,
WR# and PSEN# signals (see Table 13).
2
RD0
1PAGE#
Page Mode Select bit(1)
Clear to select the faster Page mode with A15:8/D7:0 on Port 2 and A7:0 on
Port 0.
Set to select the non-Page mode(2) with A15:8 on Port 2 and A7:0/D7:0 on Port
0.
0SRC
Source Mode/Binary Mode Select bit
Clear to select the binary mode.
Set to select the source mode.
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