EM78860
8-BIT MICRO-CONTROLLER
CODE Option Register
The chip has one CODE option register which is not part of the normal program memory. The option bits
cannot be accessed during normal program execution.
7
-
6
-
5
-
4
-
3
-
2
-
1
0
-
/POVD
• Bit 0 : unsed
• Bit 1 ( /POVD ) : Power on voltage detector.
0 : enable
1 : disable
/POVD
1.8V reset
power on
reset
yes
3.6V detect no 3.6V detect control
sleep mode
current
1µA
reset
yes
by RA(5)
yes
1
0
no
yes
yes
yes
yes
15µA
• Bit 2~7 : unused, must be "0"s.
LCD Driver
The chip can drive LCD directly and has 60 segments and 16 commons that can drive 60*16 dots totally. LCD
block is made up of LCD driver , display RAM, segment output pins , common output pins and LCD operating
power supply pins.
Duty , bias , the number of segment , the number of common and frame frequency are determined by LCD mode
register . LCD control register.
The basic structure contains a timing control which uses the basic frequency 32.768KHz to generate the proper
timing for different duty and display access. RE register is a command register for LCD driver, the LCD display
( disable, enable, blanking) is controlled by LCD_C and the driving duty and bias is decided by LCD_M and the
display data is stored in data RAM which address and data access controlled by registers RC and RD.
32.768KHz
RC(address)
RD(data)
LCD timing control
RAM
RE(LCD_C,LCD_M)
LCD duty control
Display data control
LCD commom control
LCD SEGMENT control
Bias control
Vdd-Vlcd
SEG
COM
Fig13. LCD DRIVER CONTROL
* This specification are subject to be changed without notice.
18
6.24.1998
ELAN [ ELAN MICROELECTRONICS CORP ]
