參數(shù)資料
型號: DS5000
英文描述: Soft Microcontroller Module
中文描述: 柔性微控制器模塊
文件頁數(shù): 5/19頁
文件大?。?/td> 131K
代理商: DS5000
DS5000(T)
021998 5/19
DS5000(T) LOGICAL ADDRESS SPACES
Figure 2
MEMORY
MEMORY
64K
32K
8K
NV RAM
PROGRAM
NV RAM
MEMORY
SPECIAL
REGISTERS
DATA
REGISTERS
INTERNAL REGISTERS
LEGEND:
=
ON–CHIP REGISTERS
=
ACCESSED VIA EXPANDED BUS
=
NV RAM MEMORY
PADDR.
RANGE
ADDR.
127
0
255
128
64K
32K
8K
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 DS5000(T). This
feature allows the loading of the application program
to be delayed until the DS5000(T) is installed in the
end system. Dallas Semiconductor strongly recom-
mends the use of serial program loading because of
its versatility and ease of use.
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 8751H microcontroller pro-
gramming mode.
The DS5000(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 DS5000(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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