EM6520 EM Microelectronic, EM6520 Datasheet - Page 34

• Manufacturer Part Number: EM6520
• Description: MFP version of EM6620 Ultra Low Power Microcontroller 4x8 LCD Driver
• Manufacturer: EM Microelectronic

11 RAM
The EM6520 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.
EM Microelectronic-Marin SA CH-2074 Marin, Switzerland, Tel. [phone], Fax. [phone]
34
RAM1_0
RAM1_63
RAM1_62
RAM1_61
RAM1_60
RAM1_3
RAM1_2
RAM1_1
64 x 4 direct addressable RAM1
.
.
.
Figure 24. RAM Architecture
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
.
.
.
© EM Microelectonic-Marin SA , 12/98 Rev. A/246
A COMPANY OF
EM6520