PCF8578T/1 NXP Semiconductors, PCF8578T/1 Datasheet - Page 24

• Manufacturer Part Number: PCF8578T/1
• Description: IC, LCD DRIVER, ROW/COLUMN, 56VSOP
• Manufacturer: NXP Semiconductors

Specifications of PCF8578T/1

• Supply Current: 20µA
• No. Of Digits / Alpha: 36
• Meter Display Type: LCD
• Supply Voltage Range: 2.5V To 6V
• Driver Case Style: VSOP
• No. Of Pins: 56
• Operating Temperature Range: -40°C To +85°C
• Base: RoHS Compliant
• No. Of Segments: 384
• Interface Type: I2C
• Rohs Compliant: Yes

NXP Semiconductors
PCF8578_6
Product data sheet
8.11 RAM access
Table 15.
[1]
RAM operations are only possible when the PCF8578 is in mixed mode. In this event its
hardware subaddress is internally fixed at 0000 and the hardware subaddresses of any
PCF8579 used in conjunction with the PCF8578 must start at 0001.
There are three RAM-access modes:
These modes are specified by the bits G[1:0] of the RAM-access command. The
RAM-access command controls the order in which data is written to or read from the RAM
(see
To store RAM data, the user specifies the location into which the first byte will be loaded
(see
Subsequent data bytes will be written or read according to the chosen RAM-access mode.
Device subaddresses are automatically incremented between devices until the last device
is reached. If the last device has subaddress 15, further display data transfers will lead to
a wrap-around of the subaddress to 0.
Bit
7
6
5 to 0
Fig 17. RAM addressing scheme
•
•
•
•
•
•
Values shown in decimal.
Character
Half-graphic
Full-graphic
Device subaddress (specified by the device-select command)
RAM X-address (specified by the bits X[5:0] of the load-X-address command)
RAM bank (specified by the bits Y[1:0] of the RAM-access command)
Figure
Figure
MSB
LSB
Symbol
C
-
X[5:0]
Load-X-address - command bit description
18).
19):
1 byte
Rev. 06 — 5 May 2009
0
Value
0, 1
0
0 to 39
LCD row/column driver for dot matrix graphic displays
[1]
X address
Description
see
fixed value
RAM column address;
six bits of immediate data, transferred to the
X-address pointer to define one of forty display
RAM columns (see
Table 10
X max
Figure
17)
PCF8578
© NXP B.V. 2009. All rights reserved.
Y max
0
Y address
001aaj920
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