DS1986 Ver la hoja de datos (PDF) - Maxim Integrated
Número de pieza
componentes Descripción
Fabricante
DS1986 Datasheet PDF : 28 Pages
| |||
DS1986 MEMORY MAP Figure 4
DS1986
STARTING
ADDRESS
0000H
64K BIT
EPROM
0020H
0040H
1FE0H
8-BIT
SCRATCHPAD
32-BYTE FINAL STORAGE EPROM
32-BYTE FINAL STORAGE EPROM
32-BYTE FINAL STORAGE EPROM
PAGE 0
PAGE 1
PAGE 255
REDIRECTION BIT MAP OF WRITE-PROTECT BITS WRITE-PROTECT BITS 325 BYTES
BYTES
USED PAGES REDIRECTION BYTES
DATA MEMORY
STATUS MEMORY
STATUS MEMORY MAP
44 PAGES
OF
8 BYTES
EACH
8 BYTES
WRITE-PROTECT BITS
DATA MEMORY
WRITE-PROTECT BITS
OF REDIRECTION BYTES
BIT MAP OF
USED PAGES
RESERVED FOR
FUTURE EXTENSIONS
REDIRECTION
BYTES
000H
BIT 0 OF ADDRESS 000H=WRITE-
PROTECT OF PAGE 0, ETC.
01FH
020H
03FH
040H
05FH
060H
OFFH
100H
1FFH
ADDRESS 100H=PAGE ADDRESS
REDIRECTION BYTE FOR
PAGE 0, ETC.
MEMORY FUNCTION COMMANDS
The “Memory Function Flow Chart” (Figure 5) describes the protocols necessary for accessing the
various data fields within the DS1986. The Memory Function Control section, 8-bit scratchpad, and the
Program Voltage Detect circuit combine to interpret the commands issued by the bus master and create
the correct control signals within the device. A three-byte protocol is issued by the bus master. It is
comprised of a command byte to determine the type of operation and two address bytes to determine the
specific starting byte location within a data field. The command byte indicates if the device is to be read
or written. Writing data involves not only issuing the correct command sequence but also providing a 12-
7 of 28
Share Link: 