PCF8577C View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
PCF8577C Datasheet PDF : 28 Pages
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Philips Semiconductors
LCD direct/duplex driver with
I2C-bus interface
Product specification
PCF8577C
6.10 Display memory mapping
The mapping between the eight segment registers and the segment outputs S1 to S32 is given in Tables 1 and 2.
Since only one register bit per segment is needed in the direct drive mode, the BANK bit allows swapping of display
information. If BANK is set to logic 0 even bytes (BANK A) are displayed; if BANK is set to logic 1 odd bytes (BANK B)
are displayed. BP1 is always used for the backplane output in the direct drive mode. In duplex mode even bytes
(BANK A) correspond to backplane 1 (BP1) and odd bytes (BANK B) correspond to backplane 2 (BP2).
Table 1 Segment byte-segment driver mapping in direct drive mode
MODE BANK
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
V
2
V
1
V
0
SEGMENT/
BIT/
REGISTER
MSB
7
6
5
4
3
2
1
LSB BACK-
0 PLANE
000
0
S8 S7 S6 S5 S4 S3 S2 S1 BP1
001
1
S8 S7 S6 S5 S4 S3 S2 S1 BP1
010
2
S16 S15 S14 S13 S12 S11 S10 S9 BP1
011
3
S16 S15 S14 S13 S12 S11 S10 S9 BP1
100
4
S24 S23 S22 S21 S20 S19 S18 S17 BP1
101
5
S24 S23 S22 S21 S20 S19 S18 S17 BP1
110
6
S32 S31 S30 S29 S28 S27 S26 S25 BP1
111
7
S32 S31 S30 S29 S28 S27 S26 S25 BP1
Mapping example: bit 0 of register 7 controls the LCD segment S25 if BANK bit is a logic 1.
Table 2 Segment byte-segment driver mapping in duplex mode
MODE BANK(1)
V
2
V
1
V
0
SEGMENT/
BIT/
REGISTER
MSB
7
6
5
4
3
2
1
LSB BACK-
0 PLANE
1
X
000
0
S8 S7 S6 S5 S4 S3 S2 S1 BP1
1
X
001
1
S8 S7 S6 S5 S4 S3 S2 S1 BP2
1
X
010
2
S16 S15 S14 S13 S12 S11 S10 S9 BP1
1
X
011
3
S16 S15 S14 S13 S12 S11 S10 S9 BP2
1
X
100
4
S24 S23 S22 S21 S20 S19 S18 S17 BP1
1
X
101
5
S24 S23 S22 S21 S20 S19 S18 S17 BP2
1
X
110
6
S32 S31 S30 S29 S28 S27 S26 S25 BP1
1
X
111
7
S32 S31 S30 S29 S28 S27 S26 S25 BP2
Note
1. Where X = don’t care.
Mapping example: bit 7 of register 5 controls the LCD segment S24/BP2.
1998 Jul 30
9
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