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參數(shù)資料
| 型號(hào)： | PCF2104NU |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | LCD controller/driver |
| 中文描述： | LCD控制器/驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 18/56頁 |
| 文件大小： | 366K |
| 代理商： | PCF2104NU |
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1997 Dec 16
18
Philips Semiconductors
Product specification
LCD controller/driver
PCF2104x
8.15
Programming of MUX 1 : 32 displays with
PCF2104x
To drive a 2-line by 24 characters MUX 1 : 32 display, use
instruction ‘Function set’ to set M, N to 0, 1 (respectively).
To drive a 4-line by 12 characters MUX 1:32 display, use
instruction ‘Function set’ to set M, N to 1, 1 (respectively).
8.16
Reset function
The PCF2104 automatically initializes (resets) when
power is turned on. The state after reset is given in
Table 2.
Table 2
State after reset
STEP
DESCRIPTION
1
2
Display clear.
Function set:
DL = 1: 8-bit interface
M, N = 0 1-line display
G = 0: not used
Display on/off control:
D = 0: display off
C = 0: cursor off;
B = 0: blink off;
Entry mode set:
I/D = 1: +1 (increment)
G = 0: not used
Default address pointer to DDRAM. The Busy
Flag (BF) indicates the busy state (BF = logic 1)
until initialization ends. The busy state lasts
2 ms. The chip may also be initialized by
software. See Tables 10 and 11.
I
2
C-bus interface reset.
3
4
5
6
9
INSTRUCTIONS
Only two PCF2104x registers, the instruction register (IR)
and the data register (DR) can be directly controlled by the
microcontroller. Before internal operation, control
information is stored temporarily in these registers to allow
interface to various types of microcontrollers which
operate at different speeds or to allow interfacing to
peripheral control ICs.
The PCF2104x operation is controlled by the instructions
shown in Table 3 together with their execution time.
Details are explained in subsequent sections.
Instructions are of 4 categories, those that:
1.
Designate PCF2104x functions such as display
format, data length, etc.
2.
Set internal RAM addresses
3.
Perform data transfer with internal RAM
4.
Others.
In normal use, category 3 instructions are used most
frequently. However, automatic incrementing by 1
(or decrementing by 1) of internal RAM addresses after
each data write lessens the microcontroller program load.
The display shift in particular can be performed
concurrently with display data write, thus enabling the
designer to develop systems in minimum time with
maximum programming efficiency.
During internal operation, no instruction other than the
Busy Flag/address read instruction will be executed.
Because the Busy Flag is set to logic 1 while an instruction
is being executed, it is advisable to ensure that the flag it
is at logic 0 before sending the next instruction or wait for
the maximum instruction execution time, as given in
Table 3. An instruction sent while the Busy Flag is HIGH
will not be executed.
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相關(guān)代理商/技術(shù)參數(shù) |
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| PCF2104NU/2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:LCD controller/driver |
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