UPD16434 NEC, UPD16434 Datasheet - Page 14

• Manufacturer Part Number: UPD16434
• Description: 1/8/ 1/16 DUTY LCD CONTROLLER/DRIVER
• Manufacturer: NEC

14
2.4 Data Pointer
memory address.
LDPI command.
counter contents specify the address (00H to 31H) in the bank specified by the bank flag. The 6-bit binary counter is an
up/down counter. Its contents are modified (+1, 1, or held) each time a read, write, or AND operation is performed, or
an 8-bit data is input/output in the OR mode, according to the specifications for each mode setting command.
held) each time according to the command specification.
is input or a cursor processing command is executed.
The data pointer consists of a 6-bit binary counter (DP5 to DP0) and 1-bit bank flag (BNKF). It specifies the data
The contents of the bank flag and the 6-bit binary counter are set simultaneously by the immediate data from the
The bank flag contents specify the data memory bank (BNKF=0 : Bank 0, BNKF=1 : Bank 1), and the 6-bit binary
When the BSET or BRESET command is executed, the 6-bit binary counter contents are modified (+1, 1, or
In addition, in the character mode, the 6-bit binary counter contents are modified (+5, 5) each time an 8-bit data
Remark
The 6-bit binary counter value can exceed the limit of the data memory address space. For example, if
the 6-bit binary counter is decremented ( 1) from 00H, the value will be 3FH, or it is incremented (+1)
from 31H, the value will be 32H. However, the data memory will perform nothing for the command
specifying an address from 32H to 3FH.
BNKF
Figure2–4. Data Pointer Organization
DP5
Data Sheet S10299EJ4V0DS00
DP4
6-bit binary counter
DP3
DP2
DP1
DP0
PD16434