pcf8812 NXP Semiconductors, pcf8812 Datasheet - Page 14

• Manufacturer Part Number: pcf8812
• Description: 65 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 2 Explanations for symbols in Table 1
10.1
Immediately following power-on, all internal registers as
well as the RAM content are undefined; a reset pulse must
be applied.
Reset is accomplished by applying an external reset pulse
(active LOW) at the pad RES. When reset occurs within
the specified time, all internal registers are reset, however
the RAM is still undefined. The state after reset is
described in Section 10.2.
The RES input must be 0.3V
V
going HIGH (see Fig.16).
10.2
After reset the LCD driver has the following state:
2004 Feb 23
PD
V
H
PRS
D, E
TC1 to
TC0
S1 to S0
V
V
BS2 to
BS0
DD(min)
OP
OP
Power-down mode (bit PD = 1)
65
0
6 to
Initialization
Reset function
(or higher) within a maximum time t
102 pixels matrix LCD driver
BIT
00
10
01
11
00
01
10
11
00
01
10
11
chip is active
horizontal addressing
use basic instruction set
V
LOW
display blank
normal mode
all display segments on
inverse video mode
V
coefficient 0
V
coefficient 1
V
coefficient 2
V
coefficient 3
2
3
4
5
V
bias system
LCD
LCD
LCD
LCD
LCD
LCD
voltage multiplier
voltage multiplier
voltage multiplier
voltage multiplier
DD
programming range;
temperature
temperature
temperature
temperature
programming
when V
0
DD
VHRL
reaches
after V
DD
chip is in Power-down mode
vertical addressing
use extended instruction set
V
HIGH
LCD
14
programming range;
Horizontal addressing (bit V = 0)
Normal instruction set (bit H = 0)
Display blank (bit E = D = 0)
Address counter bits X6 to X0 = 0; bits Y3 to Y0 = 0
Temperature control mode (bits TC1 to TC0 = 0)
Bias system (bits BS2 to BS0 = 0)
V
(bits V
After power-on; RAM data is undefined; the reset signal
does not change RAM content
All LCD outputs at V
LCD
is equal to 0; the HV-generator is switched off
OP
1
6 to V
OP
0 = 0 and bit PRS = 0)
SS
(display off).
1
0
0
0
D = 0
E = 0
TC1 to TC0 = 00
S1 to S0 = 00
V
BS2 to BS0 = 000
OP
6 to V
RESET STATE
Product specification
OP
0 = 0000000
PCF8812