PCF8576D_11 Datasheet, PDF (25/50 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates

NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
7.17 Command decoder
The command decoder identifies command bytes that arrive on the I²C-bus.
The commands available to the PCF8576D are defined in Table 7.
Table 7. Definition of PCF8576D commands
Command
Operation Code
Reference
Bit
7
6
5
4
3
2
1
0
mode-set
C
1
0
[1]
E
B
M1 M0 Table 9
load-data-pointer
C
0
P5 P4 P3 P2 P1 P0 Table 10
device-select
C
1
1
0
0
A2 A1 A0 Table 11
bank-select
C
1
1
1
1
0
I
O Table 12
blink-select
C
1
1
1
0
A
BF1 BF0 Table 13
[1] Not used.
All available commands carry a continuation bit C in their most significant bit position as
shown in Figure 18. When this bit is set, it indicates that the next byte of the transfer to
arrive will also represent a command. If this bit is reset, it indicates that the command byte
is the last in the transfer. Further bytes will be regarded as display data (see Table 8).
Table 8.
Bit
7
C bit description
Symbol Value
C
0
1
Description
continue bit
last control byte in the transfer; next byte will be regarded
as display data
control bytes continue; next byte will be a command too
Table 9.
Bit
7
6, 5
4
3
2
1 to 0
Mode-set command bits description
Symbol Value
Description
C
0, 1
see Table 8
-
10
fixed value
-
-
unused
E
display status
0
disabled (blank)^[1]
1
enabled
B
LCD bias configuration^[2]
0
1
M[1:0]
1_{⁄3 bias}
1_{⁄2 bias}
LCD drive mode selection
01
static; BP0
10
1:2 multiplex; BP0, BP1
11
1:3 multiplex; BP0, BP1, BP2
00
1:4 multiplex; BP0, BP1, BP2, BP3
[1] The possibility to disable the display allows implementation of blinking under external control.
[2] Not applicable for static drive mode.
PCF8576D
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 10 — 14 February 2011
© NXP B.V. 2011. All rights reserved.
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