PCF8820U Philips Semiconductors, PCF8820U Datasheet - Page 23

• Manufacturer Part Number: PCF8820U
• Description: 67 x 101 Grey-scale/ECB colour dot matrix LCD driver
• Manufacturer: Philips Semiconductors

Philips Semiconductors
2000 Dec 07
GR
GS
DOF
DM
EC
OC
TRS
BRS
67 101 Grey-scale/ECB colour dot matrix
LCD driver
5
1
, GR
to GS
BIT
0
0
RESET
STATE
00
1
0
0
0
0
VALUE
00
01
10
11
0
1
0
1
0
1
0
1
0
1
0
1
grey-scale register selection:
grey-scale level bits; in the reset state all 4 grey-scale registers are reset to 0;
see Section 8.1.8
display on/off
drive of voltage multiplier
clock selection
oscillator setting; see Section 8.1.10
top rows
bottom rows
register 0: applied if DDRAM content is 00
register 1: applied if DDRAM content is 01
register 2: applied if DDRAM content is 10
register 3: applied if DDRAM content is 11
display on
display off: the state of the PCF8820 is equivalent to Power-down mode
(bit PD = 1). However, temperature measurement is still possible
no direct drive
direct drive: V
internal clock
external clock
stop calibration of frame frequency
start calibration of frame frequency
not swapped
swapped: the signals for row driver outputs R23 to R33 appear at outputs
R56 to R66, and the signals for row driver outputs R56 to R66 appear at
outputs R23 to R33
not swapped
swapped: the signals for row driver outputs R0 to R22 appear at outputs
R34 to R55, and the signals for row driver outputs R34 to R55 appear at outputs
R0 to R22
LCDOUT
23
= V
DD2
; see Section 8.1.9
FUNCTION
Product specification
PCF8820