參數(shù)資料
型號(hào): DS2250T
廠(chǎng)商: Maxim Integrated Products, Inc.
英文描述: Soft Microcontroller Module(軟件微控制器模塊)
中文描述: 柔性微控制器模塊
文件頁(yè)數(shù): 6/20頁(yè)
文件大?。?/td> 163K
代理商: DS2250T
DS2250(T)
021998 6/20
DS2250(T) MEMORY MAP
Figure 2
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FFFFh
8000h
0000h
éé
=
NVRAM MEMORY
LEGEND:
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DATA
64K
éééééé
éééééé
éééééé
éééééé
NV RAM
ééééé
ééééé
ééééé
ééééé
PROGRAM
PARTITION
=
ìì
ìì
=
ECE2=1
ECE2=0
PROGRAM MEMORY
32K
EXPANDED BUS (PORTS 0 AND 2)
NOT AVAILABLE
DATA MEMORY (MOVX)
PROGRAM LOADING
The Program Load Modes allow initialization of the
NV RAM Program/Data Memory. This initialization may
be performed in one of two ways:
1. Serial Program Loading which is capable of per-
forming Bootstrap Loading of the DS2250(T). This
feature allows the loading of the application program
to be delayed until the DS2250(T) is installed in the
end system.
2. Parallel Program Load cycles which perform the ini-
tial loading from parallel address/data information
presented on the I/O port pins. This mode is timing–
set compatible with the 87C51H microcontroller pro-
gramming mode.
The DS2250(T) is placed in its Program Load configura-
tion by simultaneously applying a logic 1 to the RST pin
and forcing the PSEN line to a logic 0 level. Immediately
following this action, the DS2250(T) will look for a paral-
lel Program Load pulse, or a serial ASCII carriage return
(0DH) character received at 9600, 2400, 1200, or 300
bps over the serial port.
The hardware configurations used to select these
modes of operation are illustrated in Figure 3.
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