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參數(shù)資料
| 型號： | UPD7229 |
| 廠商： | NEC Corp. |
| 英文描述： | 1/8, 1/16 DUTY LCD CONTROLLER/DRIVER |
| 中文描述： | 1 / 8，1 / 16稅LCD控制器/驅動 |
| 文件頁數(shù)： | 14/64頁 |
| 文件大?。?/td> | 314K |
| 代理商： | UPD7229 |
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Data Sheet S10299EJ4V0DS00
14
μ
PD16434
2.4 Data Pointer
The data pointer consists of a 6-bit binary counter (DP5 to DP0) and 1-bit bank flag (BNKF). It specifies the data
memory address.
Figure2–4. Data Pointer Organization
BNKF
DP5
DP4
DP3
DP2
DP1
DP0
6-bit binary counter
The contents of the bank flag and the 6-bit binary counter are set simultaneously by the immediate data from the
LDPI command.
The bank flag contents specify the data memory bank (BNKF=0 : Bank 0, BNKF=1 : Bank 1), and the 6-bit binary
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.
When the BSET or BRESET command is executed, the 6-bit binary counter contents are modified (+1,
1, or
held) each time according to the command specification.
In addition, in the character mode, the 6-bit binary counter contents are modified (+5,
5) each time an 8-bit data
is input or a cursor processing command is executed.
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.
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