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EM6620WS11 データシート(PDF) 34 Page - EM Microelectronic - MARIN SA

部品番号 EM6620WS11
部品情報  Ultra Low Power Microcontroller with 4x8 LCD Driver
PDF  56 Pages
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メーカー  EMMICRO [EM Microelectronic - MARIN SA]
ホームページ  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6620WS11 データシート(HTML) 34 Page - EM Microelectronic - MARIN SA

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EM6620
Copyright
© 2005, EM Microelectronic-Marin SA
34
www.emmicroelectronic.com
11. RAM
The EM6620 has one 64x4 bit RAM built-in located on addresses hex 0 to 3F. All the RAM nibbles
are direct addressable.
RAM Extension : Unused R/W Registers can often be used as possible RAM extension. Be careful not to use
registers which start, stop, or reset some functions.
Unused LCD register latches can also be used as RAM extension. In case of 3 times multiplex and using all the
8 segment outputs you may have two additional 4 bit registers available. Also for each unused segment output
you may have one additional 4 bit register.
Figure 24. RAM Architecture
RAM1_63
RAM1_62
RAM1_61
RAM1_60
RAM1_0
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
.
.
.
.
.
.
RAM1_3
RAM1_2
RAM1_1
4 bit R/W
4 bit R/W
4 bit R/W
64 x 4 direct addressable RAM1



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